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Ko, Clifford Y

Title(s)Professor, Surgery
SchoolGeneral Surgery
Phone67572
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    Collapse Research 
    Collapse Research Activities and Funding
    Scaling and Spreading Electronic Capture of Patient-Reported Outcomes Using a National Surgical Quality Improvement Program
    AHRQ R18HS026189Jul 1, 2019 - Apr 30, 2022
    Role: Principal Investigator
    Plan for Extracting Intraoperative Anesthesia Data to the ACS NSQIP Database
    NIH/NLM G08LM009537Jul 15, 2007 - Jul 14, 2010
    Role: Principal Investigator
    Developing Quality Indicators to Improve the Care in Elderly Surgery Patients
    NIH/NIA R21AG028121Jun 1, 2006 - May 31, 2009
    Role: Principal Investigator

    Collapse Bibliographic 
    Collapse Publications
    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Researchers can login to make corrections and additions, or contact us for help.
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    1. Ellis RJ, Brajcich BC, Ko CY, Cohen ME, Bilimoria KY, Yopp AC, D'Angelica MI, Merkow RP. Hospital variation in use of prophylactic drains following hepatectomy. HPB (Oxford). 2020 Mar 12. PMID: 32173175.
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    2. Liu JY, Ellis RJ, Hu QL, Cohen ME, Hoyt DB, Yang AD, Bentrem DJ, Ko CY, Pawlik TM, Bilimoria KY, Merkow RP. Post Hepatectomy Liver Failure Risk Calculator for Preoperative and Early Postoperative Period Following Major Hepatectomy. Ann Surg Oncol. 2020 Feb 26. PMID: 32103417.
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    3. Ellis RJ, Zhang LM, Ko CY, Cohen ME, Bentrem DJ, Bilimoria KY, Yang AD, Talamonti MS, Merkow RP. Variation in Hospital Utilization of Minimally Invasive Distal Pancreatectomy for Localized Pancreatic Neoplasms. J Gastrointest Surg. 2019 Nov 25. PMID: 31768832.
      View in: PubMed
    4. Hu QL, Liu JY, Hobson DB, Cohen ME, Hall BL, Wick EC, Ko CY. Best Practices in Data Use for Achieving Successful Implementation of Enhanced Recovery Pathway. J Am Coll Surg. 2019 Dec; 229(6):626-632.e1. PMID: 31634564.
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    5. Hu QL, Livhits MJ, Ko CY, Yeh MW. Same-day discharge is not associated with increased readmissions or complications after thyroid operations. Surgery. 2020 Jan; 167(1):117-123. PMID: 31582306.
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    6. Dawes AJ, Sacks GD, Needleman J, Brook RH, Mittman BS, Ko CY, Cryer HG. Injury-specific variables improve risk adjustment and hospital quality assessment in severe traumatic brain injury. J Trauma Acute Care Surg. 2019 08; 87(2):386-392. PMID: 30958810.
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    7. Learn PA, Mullen MJ, Saldinger PF, Kreishman P, Cordts PR, Ko CY, Knudson MM, Elster EA. A Collaborative To Evaluate And Improve The Quality Of Surgical Care Delivered By The Military Health System. Health Aff (Millwood). 2019 08; 38(8):1313-1320. PMID: 31381406.
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    8. Hu QL, Liu JB, Ellis RJ, Liu JY, Yang AD, D'Angelica MI, Ko CY, Merkow RP. Association of preoperative biliary drainage technique with postoperative outcomes among patients with resectable hepatobiliary malignancy. HPB (Oxford). 2020 Feb; 22(2):249-257. PMID: 31350104.
      View in: PubMed
    9. Berian JR, Ban KA, Liu JB, Ko CY, Feldman LS, Thacker JK. Adherence to Enhanced Recovery Protocols in NSQIP and Association With Colectomy Outcomes. Ann Surg. 2019 03; 269(3):486-493. PMID: 29064887.
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    10. Ellis RJ, Gupta AR, Hewitt DB, Merkow RP, Cohen ME, Ko CY, Bilimoria KY, Bentrem DJ, Yang AD. Risk factors for post-pancreaticoduodenectomy delayed gastric emptying in the absence of pancreatic fistula or intra-abdominal infection. J Surg Oncol. 2019 Jun; 119(7):925-931. PMID: 30737792.
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    11. Squitieri L, Russell TA, Ko CY. When One Data Set Is Insufficient-Things to Consider When Linking Secondary Data. JAMA Surg. 2019 02 01; 154(2):186-187. PMID: 30516795.
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    12. Kelz RR, Sellers MM, Merkow R, Aggarwal R, Ko CY. Defining the Content for a Quality and Safety in Surgery Curriculum Using a Nominal Group Technique. J Surg Educ. 2019 May - Jun; 76(3):795-801. PMID: 30466885.
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    13. Mohammed Ilyas MI, Haggstrom DA, Maggard-Gibbons MA, Wendel CS, Rawl S, Schmidt CM, Ko CY, Krouse RS. Patients With Temporary Ostomies: Veterans Administration Hospitals Multi-institutional Retrospective Study. J Wound Ostomy Continence Nurs. 2018 Nov/Dec; 45(6):510-515. PMID: 30395126.
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    14. Liu JB, Berian JR, Liu Y, Ko CY, Weber SM. Trends in perioperative outcomes of hospitals performing major cancer surgery. J Surg Oncol. 2018 Sep; 118(4):694-703. PMID: 30129674.
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    15. Ban KA, Berian JR, Liu JB, Ko CY, Feldman LS, Thacker JKM. Effect of Diagnosis on Outcomes in the Setting of Enhanced Recovery Protocols. Dis Colon Rectum. 2018 Jul; 61(7):847-853. PMID: 29878952.
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    16. Quinn CM, Bilimoria KY, Chung JW, Ko CY, Cohen ME, Stulberg JJ. Creating Individual Surgeon Performance Assessments in a Statewide Hospital Surgical Quality Improvement Collaborative. J Am Coll Surg. 2018 09; 227(3):303-312.e3. PMID: 29940332.
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    17. Siletz A, Childers CP, Faltermeier C, Singer ES, Hu QL, Ko CY, Kates SL, Maggard-Gibbons M, Wick E. Surgical Technical Evidence Review of Hip Fracture Surgery Conducted for the AHRQ Safety Program for Improving Surgical Care and Recovery. Geriatr Orthop Surg Rehabil. 2018; 9:2151459318769215. PMID: 29844947.
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    18. Liu JY, Hu QL, Ko CY. Databases for surgical health services research: National Trauma Data Bank and Trauma Quality Improvement Program. Surgery. 2018 11; 164(5):919-920. PMID: 29429579.
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    19. Hu QL, Ellis RJ, Ko CY. Databases for surgical health services research: National cancer database. Surgery. 2019 03; 165(3):499-500. PMID: 29455842.
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    20. Childers CP, Siletz AE, Singer ES, Faltermeier C, Hu QL, Ko CY, Golladay GJ, Kates SL, Wick EC, Maggard-Gibbons M. Surgical Technical Evidence Review for Elective Total Joint Replacement Conducted for the AHRQ Safety Program for Improving Surgical Care and Recovery. Geriatr Orthop Surg Rehabil. 2018; 9:2151458518754451. PMID: 29468091.
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    21. Ellis RJ, Liu JY, Ko CY. Databases for surgical health services research: American College of Surgeons National Surgical Quality Improvement Program. Surgery. 2018 08; 164(2):173-175. PMID: 29402449.
      View in: PubMed
    22. Liu JB, Liu Y, Cohen ME, Ko CY, Sweitzer BJ. Defining the Intrinsic Cardiac Risks of Operations to Improve Preoperative Cardiac Risk Assessments. Anesthesiology. 2018 02; 128(2):283-292. PMID: 29337744.
      View in: PubMed
    23. Squitieri L, Waxman DA, Mangione CM, Saliba D, Ko CY, Needleman J, Ganz DA. Evaluation of the Present-on-Admission Indicator among Hospitalized Fee-for-Service Medicare Patients with a Pressure Ulcer Diagnosis: Coding Patterns and Impact on Hospital-Acquired Pressure Ulcer Rates. Health Serv Res. 2018 08; 53 Suppl 1:2970-2987. PMID: 29552746.
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    24. Wandling MW, Ko CY, Bankey PE, Cribari C, Cryer HG, Diaz JJ, Duane TM, Hameed SM, Hutter MM, Metzler MH, Regner JL, Reilly PM, Reines HD, Sperry JL, Staudenmayer KL, Utter GH, Crandall ML, Bilimoria KY, Nathens AB. Expanding the scope of quality measurement in surgery to include nonoperative care: Results from the American College of Surgeons National Surgical Quality Improvement Program emergency general surgery pilot. J Trauma Acute Care Surg. 2017 11; 83(5):837-845. PMID: 29068873.
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    25. Liu JB, Berian JR, Ban KA, Liu Y, Cohen ME, Angelos P, Matthews JB, Hoyt DB, Hall BL, Ko CY. Outcomes of Concurrent Operations: Results From the American College of Surgeons' National Surgical Quality Improvement Program. Ann Surg. 2017 09; 266(3):411-420. PMID: 28650359.
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    26. Cohen ME, Hall BL, Liu Y, Ko CY. Response to "Does Participation in the ACS-NSQIP Improve Outcomes?" Ann Surg. 2017 08; 266(2):e33-e34. PMID: 28692562.
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    27. Squitieri L, Ganz DA, Mangione CM, Needleman J, Romano PS, Saliba D, Ko CY, Waxman DA. Consistency of pressure injury documentation across interfacility transfers. BMJ Qual Saf. 2018 03; 27(3):182-189. PMID: 28754811.
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    28. Liu JB, D'Angelica MI, Ko CY. The Randomized Registry Trial: Two Birds, One Stone. Ann Surg. 2017 06; 265(6):1064-1065. PMID: 28121676.
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    29. Sacks GD, Dawes AJ, Ettner SL, Brook RH, Fox CR, Russell MM, Ko CY, Maggard-Gibbons M. Impact of a Risk Calculator on Risk Perception and Surgical Decision Making: A Randomized Trial. Ann Surg. 2016 Dec; 264(6):889-895. PMID: 27192347.
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    30. Cohen ME, Liu Y, Huffman KM, Ko CY, Hall BL. On-demand Reporting of Risk-adjusted and Smoothed Rates for Quality Profiling in ACS NSQIP. Ann Surg. 2016 Dec; 264(6):966-972. PMID: 27115903.
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    31. Sacks GD, Dawes AJ, Ettner SL, Brook RH, Fox CR, Maggard-Gibbons M, Ko CY, Russell MM. Surgeon Perception of Risk and Benefit in the Decision to Operate. Ann Surg. 2016 Dec; 264(6):896-903. PMID: 27192348.
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    32. Wandling MW, Hungness ES, Pavey ES, Stulberg JJ, Schwab B, Yang AD, Shapiro MB, Bilimoria KY, Ko CY, Nathens AB. Nationwide Assessment of Trends in Choledocholithiasis Management in the United States From 1998 to 2013. JAMA Surg. 2016 12 01; 151(12):1125-1130. PMID: 27556900.
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    33. Stulberg JJ, Pavey ES, Cohen ME, Ko CY, Hoyt DB, Bilimoria KY. Effect of Flexible Duty Hour Policies on Length of Stay for Complex Intra-Abdominal Operations: A Flexibility in Duty Hour Requirements for Surgical Trainees (FIRST) Trial Analysis. J Am Coll Surg. 2017 Feb; 224(2):143-148.e1. PMID: 27884801.
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    34. Liu JB, Ko CY. Disparities in Rectal Cancer: Moving from Descriptions to Solutions. Ann Surg Oncol. 2017 Feb; 24(2):299-301. PMID: 27743226.
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    35. Ban KA, Cohen ME, Ko CY, Friedberg MW, Stulberg JJ, Zhou L, Hall BL, Hoyt DB, Bilimoria KY. Evaluation of the ProPublica Surgeon Scorecard "Adjusted Complication Rate" Measure Specifications. Ann Surg. 2016 10; 264(4):566-74. PMID: 27433895.
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    36. Berger ER, Clements RH, Morton JM, Huffman KM, Wolfe BM, Nguyen NT, Ko CY, Hutter MM. The Impact of Different Surgical Techniques on Outcomes in Laparoscopic Sleeve Gastrectomies: The First Report from the Metabolic and Bariatric Surgery Accreditation and Quality Improvement Program (MBSAQIP). Ann Surg. 2016 09; 264(3):464-73. PMID: 27433904.
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    37. Bilimoria KY, Chung JW, Hedges LV, Dahlke AR, Love R, Cohen ME, Tarpley J, Mellinger J, Mahvi DM, Kelz RR, Ko CY, Hoyt DB, Lewis FH. Development of the Flexibility in Duty Hour Requirements for Surgical Trainees (FIRST) Trial Protocol: A National Cluster-Randomized Trial of Resident Duty Hour Policies. JAMA Surg. 2016 Mar; 151(3):273-81. PMID: 26720622.
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    38. Berian JR, Ko CY, Angelos P. Surgical Professionalism: The Inspiring Surgeon of the Modern Era. Ann Surg. 2016 Mar; 263(3):428-9. PMID: 26445477.
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    39. Wakeam E, Hyder JA, Lipsitz SR, Cohen ME, Orgill DP, Zinner MJ, Ko CY, Hall BL, Finlayson SR. Hospital-level Variation in Secondary Complications After Surgery. Ann Surg. 2016 Mar; 263(3):493-501. PMID: 25876007.
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    40. Berian JR, Paruch JL, Cohen ME, Merkow RP, Dahlke AR, Ko CY, Bilimoria KY. Does Performance Vary Within the Same Hospital When Separately Examining Different Patient Subgroups? J Am Coll Surg. 2016 05; 222(5):790-797.e1. PMID: 27016904.
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    41. Bilimoria KY, Chung JW, Hedges LV, Dahlke AR, Love R, Cohen ME, Hoyt DB, Yang AD, Tarpley JL, Mellinger JD, Mahvi DM, Kelz RR, Ko CY, Odell DD, Stulberg JJ, Lewis FR. National Cluster-Randomized Trial of Duty-Hour Flexibility in Surgical Training. N Engl J Med. 2016 Feb 25; 374(8):713-27. PMID: 26836220.
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    42. Sacks GD, Lawson EH, Dawes AJ, Weiss RE, Russell MM, Brook RH, Zingmond DS, Ko CY. Variation in Hospital Use of Postacute Care After Surgery and the Association With Care Quality. Med Care. 2016 Feb; 54(2):172-9. PMID: 26595222.
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    43. Cohen ME, Liu Y, Ko CY, Hall BL. Improved Surgical Outcomes for ACS NSQIP Hospitals Over Time: Evaluation of Hospital Cohorts With up to 8 Years of Participation. Ann Surg. 2016 Feb; 263(2):267-73. PMID: 25723845.
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    44. Mohanty S, Rosenthal RA, Russell MM, Neuman MD, Ko CY, Esnaola NF. Optimal Perioperative Management of the Geriatric Patient: A Best Practices Guideline from the American College of Surgeons NSQIP and the American Geriatrics Society. J Am Coll Surg. 2016 05; 222(5):930-47. PMID: 27049783.
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    45. Lawson EH, Louie R, Zingmond DS, Sacks GD, Brook RH, Hall BL, Ko CY. Using Both Clinical Registry and Administrative Claims Data to Measure Risk-adjusted Surgical Outcomes. Ann Surg. 2016 Jan; 263(1):50-7. PMID: 25405553.
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    46. Anazawa T, Paruch JL, Miyata H, Gotoh M, Ko CY, Cohen ME, Hirahara N, Zhou L, Konno H, Wakabayashi G, Sugihara K, Mori M. Comparison of National Operative Mortality in Gastroenterological Surgery Using Web-based Prospective Data Entry Systems. Medicine (Baltimore). 2015 Dec; 94(49):e2194. PMID: 26656350.
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    47. Rajaram R, Paruch JL, Mohanty S, Holl JL, Bilimoria KY, Ko CY, Winchester DP, Patel JD, DeCamp MM. Patterns and Predictors of Chemotherapy Use for Resected Non-Small Cell Lung Cancer. Ann Thorac Surg. 2016 Feb; 101(2):533-40. PMID: 26507427.
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    48. Dawes AJ, Sacks GD, Cryer HG, Gruen JP, Preston C, Gorospe D, Cohen M, McArthur DL, Russell MM, Maggard-Gibbons M, Ko CY. Compliance With Evidence-Based Guidelines and Interhospital Variation in Mortality for Patients With Severe Traumatic Brain Injury. JAMA Surg. 2015 Oct; 150(10):965-72. PMID: 26200744.
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    49. Dawes AJ, Reardon S, Chen VL, Kaiser W, Russell MM, Ko CY, Lin AY. Wireless Technology to Track Surgical Patients after Discharge: A Pilot Study. Am Surg. 2015 Oct; 81(10):1061-6. PMID: 26463309.
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    50. Hall BL, Huffman KM, Hamilton BH, Paruch JL, Zhou L, Richards KE, Cohen ME, Ko CY. Profiling Individual Surgeon Performance Using Information from a High-Quality Clinical Registry: Opportunities and Limitations. J Am Coll Surg. 2015 Nov; 221(5):901-13. PMID: 26363711.
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    51. Sacks GD, Lawson EH, Dawes AJ, Russell MM, Maggard-Gibbons M, Zingmond DS, Ko CY. Relationship Between Hospital Performance on a Patient Satisfaction Survey and Surgical Quality. JAMA Surg. 2015 Sep; 150(9):858-64. PMID: 26108091.
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    52. Stey AM, Kenney BD, Cohen ME, Moss RL, Hall BL, Berman L, Kraemer K, Ko CY, Vinocur CD. Estimating Adverse Events After Gastrostomy Tube Placement. Acad Pediatr. 2016 Mar; 16(2):129-35. PMID: 26306663.
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    53. Rajaram R, Chung JW, Cohen ME, Dahlke AR, Yang AD, Meeks JJ, Ko CY, Tarpley JL, Hoyt DB, Bilimoria KY. Association of the 2011 ACGME Resident Duty Hour Reform with Postoperative Patient Outcomes in Surgical Specialties. J Am Coll Surg. 2015 Sep; 221(3):748-57. PMID: 26228013.
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    54. Merkow RP, Hall BL, Ko CY. Reply to Letter: "Ability to Prevent Death as a Sequelae of Morbidity May Be an Additional Indicator of Hospital Quality". Ann Surg. 2015 Jun; 261(6):e158-9. PMID: 24263330.
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    55. Huffman KM, Cohen ME, Ko CY, Hall BL. A Comprehensive Evaluation of Statistical Reliability in ACS NSQIP Profiling Models. Ann Surg. 2015 Jun; 261(6):1108-13. PMID: 25211276.
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    56. Sacks GD, Shannon EM, Dawes AJ, Rollo JC, Nguyen DK, Russell MM, Ko CY, Maggard-Gibbons MA. Teamwork, communication and safety climate: a systematic review of interventions to improve surgical culture. BMJ Qual Saf. 2015 Jul; 24(7):458-67. PMID: 26002946.
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    57. Rajaram R, Ju MH, Bilimoria KY, Ko CY, DeCamp MM. National evaluation of hospital readmission after pulmonary resection. J Thorac Cardiovasc Surg. 2015 Dec; 150(6):1508-14.e2. PMID: 26092506.
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    58. Stey AM, Russell MM, Zingmond DS, Gibbons MM, Hall BL, Needleman J, Lawson EH, Liu N, Ko CY. Using Merged Clinical and Claims Registry Data to Identify High Utilizers of Surgical Inpatient Care 1 Year after Colectomy. J Am Coll Surg. 2015 Aug; 221(2):441-51.e1. PMID: 26141469.
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    59. Spolverato G, Ejaz A, Kim Y, Hall BL, Bilimoria K, Cohen M, Ko C, Pitt H, Pawlik TM. Patterns of care among patients undergoing hepatic resection: a query of the National Surgical Quality Improvement Program-targeted hepatectomy database. J Surg Res. 2015 Jun 15; 196(2):221-8. PMID: 25881789.
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    60. Stey AM, Kenney BD, Moss RL, Hall BL, Berman L, Cohen ME, Kraemer K, Ko CY, Vinocur CD. A risk calculator predicting postoperative adverse events in neonates undergoing major abdominal or thoracic surgery. J Pediatr Surg. 2015 Jun; 50(6):987-91. PMID: 25824439.
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    61. Sacks GD, Lawson EH, Dawes AJ, Gibbons MM, Zingmond DS, Ko CY. Which Patients Require More Care after Hospital Discharge? An Analysis of Post-Acute Care Use among Elderly Patients Undergoing Elective Surgery. J Am Coll Surg. 2015 Jun; 220(6):1113-1121.e2. PMID: 25872686.
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    62. Dawes AJ, Sacks GD, Cryer HG, Gruen JP, Preston C, Gorospe D, Cohen M, McArthur DL, Russell MM, Maggard-Gibbons M, Ko CY. Intracranial pressure monitoring and inpatient mortality in severe traumatic brain injury: A propensity score-matched analysis. J Trauma Acute Care Surg. 2015 Mar; 78(3):492-501; discussion 501-2. PMID: 25710418.
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    63. Stey AM, Russell MM, Sugar CA, Hall BL, Zingmond DS, Lawson EH, Ko CY. Extending the value of the National Surgical Quality Improvement Program claims dataset to study long-term outcomes: Rate of repeat ventral hernia repair. Surgery. 2015 Jun; 157(6):1157-65. PMID: 25731782.
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    64. Merkow RP, Ju MH, Chung JW, Hall BL, Cohen ME, Williams MV, Tsai TC, Ko CY, Bilimoria KY. Underlying reasons associated with hospital readmission following surgery in the United States. JAMA. 2015 Feb 03; 313(5):483-95. PMID: 25647204.
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    65. Stey AM, Russell MM, Ko CY, Sacks GD, Dawes AJ, Gibbons MM. Clinical registries and quality measurement in surgery: a systematic review. Surgery. 2015 Feb; 157(2):381-95. PMID: 25616951.
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    66. Lawson EH, Zingmond DS, Hall BL, Louie R, Brook RH, Ko CY. Comparison between clinical registry and medicare claims data on the classification of hospital quality of surgical care. Ann Surg. 2015 Feb; 261(2):290-6. PMID: 25569029.
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    67. Russell MM, Ganz PA, Lopa S, Yothers G, Ko CY, Arora A, Atkins JN, Bahary N, Soori GS, Robertson JM, Eakle J, Marchello BT, Wozniak TF, Beart RW, Wolmark N. Comparative effectiveness of sphincter-sparing surgery versus abdominoperineal resection in rectal cancer: patient-reported outcomes in National Surgical Adjuvant Breast and Bowel Project randomized trial R-04. Ann Surg. 2015 Jan; 261(1):144-8. PMID: 24670844.
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    68. Ju MH, Ko CY, Hall BL, Bosk CL, Bilimoria KY, Wick EC. A comparison of 2 surgical site infection monitoring systems. JAMA Surg. 2015 Jan; 150(1):51-7. PMID: 25426765.
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    69. Rajaram R, Chung JW, Jones AT, Cohen ME, Dahlke AR, Ko CY, Tarpley JL, Lewis FR, Hoyt DB, Bilimoria KY. Association of the 2011 ACGME resident duty hour reform with general surgery patient outcomes and with resident examination performance. JAMA. 2014 Dec 10; 312(22):2374-84. PMID: 25490328.
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    70. Stey AM, Russell MM, Hall BL, Lin A, Gibbons MM, Lawson EH, Zingmond DS, Ko CY. Is there hospital variation in long-term incisional hernia repair after abdominal surgery? J Am Coll Surg. 2015 Mar; 220(3):313-322.e2. PMID: 25542281.
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    71. Stey AM, Brook RH, Needleman J, Hall BL, Zingmond DS, Lawson EH, Ko CY. Hospital costs by cost center of inpatient hospitalization for medicare patients undergoing major abdominal surgery. J Am Coll Surg. 2015 Feb; 220(2):207-17.e11. PMID: 25529900.
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    72. Lawson EH, Zingmond DS, Stey AM, Hall BL, Ko CY. Measuring risk-adjusted value using Medicare and ACS-NSQIP: is high-quality, low-cost surgical care achievable everywhere? Ann Surg. 2014 Oct; 260(4):668-77; discussion 677-9. PMID: 25203884.
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    73. Dawes AJ, Louie R, Nguyen DK, Maggard-Gibbons M, Parikh P, Ettner SL, Ko CY, Zingmond DS. The impact of continuous Medicaid enrollment on diagnosis, treatment, and survival in six surgical cancers. Health Serv Res. 2014 Dec; 49(6):1787-811. PMID: 25256223.
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    74. Kester BS, Merkow RP, Ju MH, Peabody TD, Bentrem DJ, Ko CY, Bilimoria KY. Effect of post-discharge venous thromboembolism on hospital quality comparisons following hip and knee arthroplasty. J Bone Joint Surg Am. 2014 Sep 03; 96(17):1476-84. PMID: 25187587.
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    75. Ju MH, Chung JW, Kinnier CV, Bentrem DJ, Mahvi DM, Ko CY, Bilimoria KY. Association between hospital imaging use and venous thromboembolism events rates based on clinical data. Ann Surg. 2014 Sep; 260(3):558-64; discussion 564-6. PMID: 25115432.
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    76. Sacks GD, Dawes AJ, Russell MM, Lin AY, Maggard-Gibbons M, Winograd D, Chung HR, Tomlinson J, Tillou A, Shew SB, Hiyama DT, Cryer HG, Brunicardi FC, Hiatt JR, Ko C. Evaluation of hospital readmissions in surgical patients: do administrative data tell the real story? JAMA Surg. 2014 Aug; 149(8):759-64. PMID: 24920156.
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    77. Merkow RP, Bilimoria KY, Tomlinson JS, Paruch JL, Fleming JB, Talamonti MS, Ko CY, Bentrem DJ. Postoperative complications reduce adjuvant chemotherapy use in resectable pancreatic cancer. Ann Surg. 2014 Aug; 260(2):372-7. PMID: 24374509.
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    78. Ju MH, Cohen ME, Bilimoria KY, Latus MS, Scholl LM, Schwab BJ, Byrd CM, Ko CY, Dellinger EP, Hall BL. Effect of wound classification on risk adjustment in American College of Surgeons NSQIP. J Am Coll Surg. 2014 Sep; 219(3):371-81.e5. PMID: 25053222.
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    79. Ko CY. Expanding the research experience. Surgery. 2014 May; 155(5):839-40. PMID: 24787110.
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    80. Stey AM, Ko CY, Hall BL, Louie R, Lawson EH, Gibbons MM, Zingmond DS, Russell MM. Are procedures codes in claims data a reliable indicator of intraoperative splenic injury compared with clinical registry data? J Am Coll Surg. 2014 Aug; 219(2):237-44.e1. PMID: 24891210.
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    81. Dawes AJ, Sacks GD, Russell MM, Lin AY, Maggard-Gibbons M, Winograd D, Chung HR, Tillou A, Hiatt JR, Ko C. Preventable readmissions to surgical services: lessons learned and targets for improvement. J Am Coll Surg. 2014 Sep; 219(3):382-9. PMID: 24891209.
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    82. Paruch JL, Merkow RP, Bentrem DJ, Ko CY, Posner MC, Cohen ME, Bilimoria KY, Weber SM. Impact of hepatectomy surgical complexity on outcomes and hospital quality rankings. Ann Surg Oncol. 2014 Jun; 21(6):1773-80. PMID: 24558060.
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    83. Hoffman RL, Bartlett EK, Ko C, Mahmoud N, Karakousis GC, Kelz RR. Early discharge and readmission after colorectal resection. J Surg Res. 2014 Aug; 190(2):579-86. PMID: 24661387.
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    84. Stey AM, Moss RL, Kraemer K, Cohen ME, Ko CY, Lee Hall B. The importance of extreme weight percentile in postoperative morbidity in children. J Am Coll Surg. 2014 May; 218(5):988-96. PMID: 24680569.
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    85. Lawson EH, Hall BL, Louie R, Zingmond DS, Ko CY. Identification of modifiable factors for reducing readmission after colectomy: a national analysis. Surgery. 2014 May; 155(5):754-66. PMID: 24787101.
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    86. Merkow RP, Bilimoria KY, Bentrem DJ, Pitt HA, Winchester DP, Posner MC, Ko CY, Pawlik TM. National assessment of margin status as a quality indicator after pancreatic cancer surgery. Ann Surg Oncol. 2014 Apr; 21(4):1067-74. PMID: 24337612.
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    87. Merkow RP, Bentrem DJ, Mulcahy MF, Chung JW, Abbott DE, Kmiecik TE, Stewart AK, Winchester DP, Ko CY, Bilimoria KY. Effect of postoperative complications on adjuvant chemotherapy use for stage III colon cancer. Ann Surg. 2013 Dec; 258(6):847-53. PMID: 24169157.
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    88. Lawson EH, Ko CY, Adams JL, Chow WB, Hall BL. Reliability of evaluating hospital quality by colorectal surgical site infection type. Ann Surg. 2013 Dec; 258(6):994-1000. PMID: 23657082.
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    89. Dahlke AR, Chung JW, Holl JL, Ko CY, Rajaram R, Modla L, Makary MA, Bilimoria KY. Evaluation of initial participation in public reporting of American College of Surgeons NSQIP surgical outcomes on Medicare's Hospital Compare website. J Am Coll Surg. 2014 Mar; 218(3):374-80, 380.e1-5. PMID: 24468223.
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    90. Paruch JL, Ko CY, Bilimoria KY. An opportunity to improve informed consent and shared decision making: the role of the ACS NSQIP Surgical Risk Calculator in oncology. Ann Surg Oncol. 2014 Jan; 21(1):5-7. PMID: 24197763.
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    91. Bilimoria KY, Chung J, Ju MH, Haut ER, Bentrem DJ, Ko CY, Baker DW. Evaluation of surveillance bias and the validity of the venous thromboembolism quality measure. JAMA. 2013 Oct 09; 310(14):1482-9. PMID: 24100354.
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    92. Bilimoria KY, Liu Y, Paruch JL, Zhou L, Kmiecik TE, Ko CY, Cohen ME. Development and evaluation of the universal ACS NSQIP surgical risk calculator: a decision aid and informed consent tool for patients and surgeons. J Am Coll Surg. 2013 Nov; 217(5):833-42.e1-3. PMID: 24055383.
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    93. Lawson EH, Hall BL, Ko CY. Risk factors for superficial vs deep/organ-space surgical site infections: implications for quality improvement initiatives. JAMA Surg. 2013 Sep; 148(9):849-58. PMID: 23864108.
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    94. Merkow RP, Bentrem DJ, Cohen ME, Paruch JL, Weber SM, Ko CY, Bilimoria KY. Effect of cancer surgery complexity on short-term outcomes, risk predictions, and hospital comparisons. J Am Coll Surg. 2013 Oct; 217(4):685-93. PMID: 23830986.
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    95. Merkow RP, Bilimoria KY, Ko CY. Surgical quality measurement: an evolving science. JAMA Surg. 2013 Jul; 148(7):586-7. PMID: 23864242.
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    96. Lawson EH, Hall BL, Louie R, Ettner SL, Zingmond DS, Han L, Rapp M, Ko CY. Association between occurrence of a postoperative complication and readmission: implications for quality improvement and cost savings. Ann Surg. 2013 Jul; 258(1):10-8. PMID: 23579579.
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    97. Merkow RP, Bentrem DJ, Chung JW, Paruch JL, Ko CY, Bilimoria KY. Differences in patients, surgical complexity, and outcomes after cancer surgery at National Cancer Institute-designated cancer centers compared to other hospitals. Med Care. 2013 Jul; 51(7):606-13. PMID: 23604012.
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    98. Cohen ME, Ko CY, Bilimoria KY, Zhou L, Huffman K, Wang X, Liu Y, Kraemer K, Meng X, Merkow R, Chow W, Matel B, Richards K, Hart AJ, Dimick JB, Hall BL. Optimizing ACS NSQIP modeling for evaluation of surgical quality and risk: patient risk adjustment, procedure mix adjustment, shrinkage adjustment, and surgical focus. J Am Coll Surg. 2013 Aug; 217(2):336-46.e1. PMID: 23628227.
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    99. Merkow RP, Hall BL, Cohen ME, Wang X, Adams JL, Chow WB, Lawson EH, Bilimoria KY, Richards K, Ko CY. Validity and feasibility of the american college of surgeons colectomy composite outcome quality measure. Ann Surg. 2013 Mar; 257(3):483-9. PMID: 23299518.
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    100. Merkow RP, Bentrem DJ, Winchester DP, Stewart AK, Ko CY, Bilimoria KY. Effect of including cancer-specific variables on risk-adjusted hospital surgical quality comparisons. Ann Surg Oncol. 2013 Jun; 20(6):1766-73. PMID: 23354565.
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    101. Bruny JL, Hall BL, Barnhart DC, Billmire DF, Dias MS, Dillon PW, Fisher C, Heiss KF, Hennrikus WL, Ko CY, Moss L, Oldham KT, Richards KE, Shah R, Vinocur CD, Ziegler MM. American College of Surgeons National Surgical Quality Improvement Program Pediatric: a beta phase report. J Pediatr Surg. 2013 Jan; 48(1):74-80. PMID: 23331796.
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    102. Lawson EH, Louie R, Zingmond DS, Brook RH, Hall BL, Han L, Rapp M, Ko CY. A comparison of clinical registry versus administrative claims data for reporting of 30-day surgical complications. Ann Surg. 2012 Dec; 256(6):973-81. PMID: 23095667.
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    103. Merkow RP, Kmiecik TE, Bentrem DJ, Winchester DP, Stewart AK, Ko CY, Bilimoria KY. Effect of including cancer-specific variables on models examining short-term outcomes. Cancer. 2013 Apr 01; 119(7):1412-9. PMID: 23184472.
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    104. Lawson EH, Ko CY, Louie R, Han L, Rapp M, Zingmond DS. Linkage of a clinical surgical registry with Medicare inpatient claims data using indirect identifiers. Surgery. 2013 Mar; 153(3):423-30. PMID: 23122901.
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    105. Merkow RP, Bilimoria KY, McCarter MD, Phillips JD, DeCamp MM, Sherman KL, Ko CY, Bentrem DJ. Short-term outcomes after esophagectomy at 164 American College of Surgeons National Surgical Quality Improvement Program hospitals: effect of operative approach and hospital-level variation. Arch Surg. 2012 Nov; 147(11):1009-16. PMID: 23165615.
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    106. Lawson EH, Gibbons MM, Ko CY, Shekelle PG. The appropriateness method has acceptable reliability and validity for assessing overuse and underuse of surgical procedures. J Clin Epidemiol. 2012 Nov; 65(11):1133-43. PMID: 23017632.
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    107. Chow WB, Merkow RP, Cohen ME, Bilimoria KY, Ko CY. Association between postoperative complications and reoperation for patients undergoing geriatric surgery and the effect of reoperation on mortality. Am Surg. 2012 Oct; 78(10):1137-42. PMID: 23025958.
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    108. Chow WB, Rosenthal RA, Merkow RP, Ko CY, Esnaola NF. Optimal preoperative assessment of the geriatric surgical patient: a best practices guideline from the American College of Surgeons National Surgical Quality Improvement Program and the American Geriatrics Society. J Am Coll Surg. 2012 Oct; 215(4):453-66. PMID: 22917646.
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    109. Ko CY, Merkow RP. Outcomes research in surgical oncology. Surg Oncol Clin N Am. 2012 Jul; 21(3):xv-xvi. PMID: 22583999.
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    110. Merkow RP, Bilimoria KY, Chow WB, Merkow JS, Weyant MJ, Ko CY, Bentrem DJ. Variation in lymph node examination after esophagectomy for cancer in the United States. Arch Surg. 2012 Jun; 147(6):505-11. PMID: 22351873.
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    111. Lawson EH, Gibbons MM, Ko CY. Appropriate use of surgical procedures for patients with cancer. Surg Oncol Clin N Am. 2012 Jul; 21(3):479-86, ix. PMID: 22583995.
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    112. Dimick JB, Ghaferi AA, Osborne NH, Ko CY, Hall BL. Reliability adjustment for reporting hospital outcomes with surgery. Ann Surg. 2012 Apr; 255(4):703-7. PMID: 22388108.
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    113. Merkow RP, Hall BL, Cohen ME, Dimick JB, Wang E, Chow WB, Ko CY, Bilimoria KY. Relevance of the c-statistic when evaluating risk-adjustment models in surgery. J Am Coll Surg. 2012 May; 214(5):822-30. PMID: 22440055.
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    114. Lawson EH, Hall BL, Esnaola NF, Ko CY. Identifying worsening surgical site infection performance: control charts versus risk-adjusted rate outlier status. Am J Med Qual. 2012 Sep-Oct; 27(5):391-7. PMID: 22326982.
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    115. Bilimoria K, Ko CY. Clinical scholars in residence program: A beneficial experience for surgical residents and the ACS. Bull Am Coll Surg. 2012 Feb; 97(2):51-2. PMID: 24010257.
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    116. Livhits M, Mercado C, Yermilov I, Parikh JA, Dutson E, Mehran A, Ko CY, Gibbons MM. Preoperative predictors of weight loss following bariatric surgery: systematic review. Obes Surg. 2012 Jan; 22(1):70-89. PMID: 21833817.
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    117. Lawson EH, Gibbons MM, Ingraham AM, Shekelle PG, Ko CY. Appropriateness criteria to assess variations in surgical procedure use in the United States. Arch Surg. 2011 Dec; 146(12):1433-40. PMID: 22184308.
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    118. Merkow RP, Bilimoria KY, McCarter MD, Chow WB, Gordon HS, Stewart AK, Ko CY, Bentrem DJ. Effect of histologic subtype on treatment and outcomes for esophageal cancer in the United States. Cancer. 2012 Jul 01; 118(13):3268-76. PMID: 22006369.
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    119. Zenilman ME, Chow WB, Ko CY, Ibrahim AM, Makary MA, Lagoo-Deenadayalan S, Dardik A, Boyd CA, Riall TS, Sosa JA, Tummel E, Gould LJ, Segev DL, Berger JC. New developments in geriatric surgery. Curr Probl Surg. 2011 Oct; 48(10):670-754. PMID: 21907843.
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    120. Cronin J, Livhits M, Mercado C, Chen F, Foster N, Chandler C, Gibbons M, Ko CY, Chen DC. Quality improvement pilot program for vulnerable elderly surgical patients. Am Surg. 2011 Oct; 77(10):1305-8. PMID: 22127075.
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    121. Hutter MM, Schirmer BD, Jones DB, Ko CY, Cohen ME, Merkow RP, Nguyen NT. First report from the American College of Surgeons Bariatric Surgery Center Network: laparoscopic sleeve gastrectomy has morbidity and effectiveness positioned between the band and the bypass. Ann Surg. 2011 Sep; 254(3):410-20; discussion 420-2. PMID: 21865942.
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    122. Lawson EH, Ko CY. Preventing unintended consequences of quality measurement. Arch Surg. 2011 Sep; 146(9):1072-3. PMID: 22029071.
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    123. Merkow RP, Ko CY. Evidence-based medicine in surgery: the importance of both experimental and observational study designs. JAMA. 2011 Jul 27; 306(4):436-7. PMID: 21791695.
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    124. Merkow RP, Bilimoria KY, McCarter MD, Chow WB, Ko CY, Bentrem DJ. Use of multimodality neoadjuvant therapy for esophageal cancer in the United States: assessment of 987 hospitals. Ann Surg Oncol. 2012 Feb; 19(2):357-64. PMID: 21769460.
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    125. Merkow RP, Bilimoria KY, McCarter MD, Cohen ME, Barnett CC, Raval MV, Caprini JA, Gordon HS, Ko CY, Bentrem DJ. Post-discharge venous thromboembolism after cancer surgery: extending the case for extended prophylaxis. Ann Surg. 2011 Jul; 254(1):131-7. PMID: 21527843.
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    126. Livhits M, Mercado C, Yermilov I, Parikh JA, Dutson E, Mehran A, Ko CY, Gibbons MM. Patient behaviors associated with weight regain after laparoscopic gastric bypass. Obes Res Clin Pract. 2011 Jul-Sep; 5(3):e169-266. PMID: 24331108.
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    127. Kao LS, Ghaferi AA, Ko CY, Dimick JB. Reliability of superficial surgical site infections as a hospital quality measure. J Am Coll Surg. 2011 Aug; 213(2):231-5. PMID: 21622011.
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    128. Livhits M, Ko CY, Leonardi MJ, Zingmond DS, Gibbons MM, de Virgilio C. Risk of surgery following recent myocardial infarction. Ann Surg. 2011 May; 253(5):857-64. PMID: 21372685.
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    129. Lawson EH, Wang X, Cohen ME, Hall BL, Tanzman H, Ko CY. Morbidity and mortality after colorectal procedures: comparison of data from the American College of Surgeons case log system and the ACS NSQIP. J Am Coll Surg. 2011 Jun; 212(6):1077-85. PMID: 21470879.
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    130. Livhits M, Gibbons MM, de Virgilio C, O'Connell JB, Leonardi MJ, Ko CY, Zingmond DS. Coronary revascularization after myocardial infarction can reduce risks of noncardiac surgery. J Am Coll Surg. 2011 Jun; 212(6):1018-26. PMID: 21441043.
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    131. Ingraham AM, Cohen ME, Raval MV, Ko CY, Nathens AB. Effect of trauma center status on 30-day outcomes after emergency general surgery. J Am Coll Surg. 2011 Mar; 212(3):277-86. PMID: 21356485.
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    132. Scher KS, Tisnado DM, Rose DE, Adams JL, Ko CY, Malin JL, Ganz PA, Kahn KL. Physician and Practice Characteristics Influencing Tumor Board Attendance: Results From the Provider Survey of the Los Angeles Women's Health Study. J Oncol Pract. 2011 Mar; 7(2):103-10. PMID: 21731518.
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    133. Wasif N, Cormier JN, Ko CY, McCahill LE, Edge SB, Wong SL, Anthony T, Kollmorgen D, Marcus SG, Bleznak A, Leong SP. Quality measurement in cancer care delivery. Ann Surg Oncol. 2011 Mar; 18(3):611-8. PMID: 21207161.
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    134. Raval MV, Dillon PW, Bruny JL, Ko CY, Hall BL, Moss RL, Oldham KT, Richards KE, Vinocur CD, Ziegler MM. Pediatric American College of Surgeons National Surgical Quality Improvement Program: feasibility of a novel, prospective assessment of surgical outcomes. J Pediatr Surg. 2011 Jan; 46(1):115-21. PMID: 21238651.
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    135. Raval MV, Bentrem DJ, Eskandari MK, Ingraham AM, Hall BL, Randolph B, Ko CY, Morton JM. The role of Surgical Champions in the American College of Surgeons National Surgical Quality Improvement Program--a national survey. J Surg Res. 2011 Mar; 166(1):e15-25. PMID: 21176914.
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    136. Kunitake H, Zheng P, Yothers G, Land SR, Fehrenbacher L, Giguere JK, Wickerham DL, Wickerham L, Ganz PA, Ko CY. Routine preventive care and cancer surveillance in long-term survivors of colorectal cancer: results from National Surgical Adjuvant Breast and Bowel Project Protocol LTS-01. J Clin Oncol. 2010 Dec 20; 28(36):5274-9. PMID: 21079140.
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    137. Raval MV, Bilimoria KY, Bentrem DJ, Stewart AK, Ko CY, Reynolds M, Wayne JD. Use of sentinel lymph node biopsy for melanoma in children and adolescents. J Surg Oncol. 2010 Nov 01; 102(6):634-9. PMID: 20721965.
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    138. Wasif N, Etzioni D, Maggard MA, Tomlinson JS, Ko CY. Trends, patterns, and outcomes in the management of malignant colonic polyps in the general population of the United States. Cancer. 2011 Mar 01; 117(5):931-7. PMID: 20960490.
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    139. Duffy JP, Kao K, Ko CY, Farmer DG, McDiarmid SV, Hong JC, Venick RS, Feist S, Goldstein L, Saab S, Hiatt JR, Busuttil RW. Long-term patient outcome and quality of life after liver transplantation: analysis of 20-year survivors. Ann Surg. 2010 Oct; 252(4):652-61. PMID: 20881772.
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    140. Livhits M, Mercado C, Yermilov I, Parikh JA, Dutson E, Mehran A, Ko CY, Gibbons MM. Behavioral factors associated with successful weight loss after gastric bypass. Am Surg. 2010 Oct; 76(10):1139-42. PMID: 21105629.
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    141. Bilimoria KY, Cohen ME, Merkow RP, Wang X, Bentrem DJ, Ingraham AM, Richards K, Hall BL, Ko CY. Comparison of outlier identification methods in hospital surgical quality improvement programs. J Gastrointest Surg. 2010 Oct; 14(10):1600-7. PMID: 20824379.
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    142. Ingraham AM, Cohen ME, Bilimoria KY, Pritts TA, Ko CY, Esposito TJ. Comparison of outcomes after laparoscopic versus open appendectomy for acute appendicitis at 222 ACS NSQIP hospitals. Surgery. 2010 Oct; 148(4):625-35; discussion 635-7. PMID: 20797745.
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    143. Ingraham AM, Cohen ME, Bilimoria KY, Raval MV, Ko CY, Nathens AB, Hall BL. Comparison of 30-day outcomes after emergency general surgery procedures: potential for targeted improvement. Surgery. 2010 Aug; 148(2):217-38. PMID: 20633727.
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    144. Kunitake H, Zingmond DS, Ryoo J, Ko CY. Caring for octogenarian and nonagenarian patients with colorectal cancer: what should our standards and expectations be? Dis Colon Rectum. 2010 May; 53(5):735-43. PMID: 20389207.
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    145. Raval MV, Bentrem DJ, Stewart AK, Ko CY, Reynolds M. Utilization of total thyroidectomy for differentiated thyroid cancer in children. Ann Surg Oncol. 2010 Oct; 17(10):2545-53. PMID: 20429037.
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    146. Wasif N, Ko CY, Farrell J, Wainberg Z, Hines OJ, Reber H, Tomlinson JS. Impact of tumor grade on prognosis in pancreatic cancer: should we include grade in AJCC staging? Ann Surg Oncol. 2010 Sep; 17(9):2312-20. PMID: 20422460.
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    147. Dimick JB, Osborne NH, Hall BL, Ko CY, Birkmeyer JD. Risk adjustment for comparing hospital quality with surgery: how many variables are needed? J Am Coll Surg. 2010 Apr; 210(4):503-8. PMID: 20347744.
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    148. Livhits M, Mercado C, Yermilov I, Parikh JA, Dutson E, Mehran A, Ko CY, Gibbons MM. Exercise following bariatric surgery: systematic review. Obes Surg. 2010 May; 20(5):657-65. PMID: 20180039.
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    149. Wasif N, Maggard MA, Ko CY, Giuliano AE. Invasive lobular vs. ductal breast cancer: a stage-matched comparison of outcomes. Ann Surg Oncol. 2010 Jul; 17(7):1862-9. PMID: 20162457.
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    150. Wasif N, Maggard MA, Ko CY, Giuliano AE. Underuse of axillary dissection for the management of sentinel node micrometastases in breast cancer. Arch Surg. 2010 Feb; 145(2):161-6. PMID: 20157084.
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    151. Chen F, Zingmond D, Ko C. More than size matters. Arch Surg. 2010 Feb; 145(2):186. PMID: 20183941.
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    152. Mercado C, Zingmond D, Karlan BY, Sekaris E, Gross J, Maggard-Gibbons M, Tomlinson JS, Ko CY. Quality of care in advanced ovarian cancer: the importance of provider specialty. Gynecol Oncol. 2010 Apr; 117(1):18-22. PMID: 20106512.
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    153. Bentrem DJ, Cohen ME, Hynes DM, Ko CY, Bilimoria KY. Identification of specific quality improvement opportunities for the elderly undergoing gastrointestinal surgery. Arch Surg. 2009 Nov; 144(11):1013-20. PMID: 19917937.
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    154. Cohen ME, Dimick JB, Bilimoria KY, Ko CY, Richards K, Hall BL. Risk adjustment in the American College of Surgeons National Surgical Quality Improvement Program: a comparison of logistic versus hierarchical modeling. J Am Coll Surg. 2009 Dec; 209(6):687-93. PMID: 19959035.
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    155. Livhits M, Mercado C, Yermilov I, Parikh JA, Dutson E, Mehran A, Ko CY, Gibbons MM. Does weight loss immediately before bariatric surgery improve outcomes: a systematic review. Surg Obes Relat Dis. 2009 Nov-Dec; 5(6):713-21. PMID: 19879814.
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    156. Merkow RP, Bilimoria KY, Cohen ME, Richards K, Ko CY, Hall BL. Variability in reoperation rates at 182 hospitals: a potential target for quality improvement. J Am Coll Surg. 2009 Nov; 209(5):557-64. PMID: 19854394.
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    157. McGory ML, Kao KK, Shekelle PG, Rubenstein LZ, Leonardi MJ, Parikh JA, Fink A, Ko CY. Developing quality indicators for elderly surgical patients. Ann Surg. 2009 Aug; 250(2):338-47. PMID: 19638913.
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    158. Ganz PA, Land SR, Antonio C, Zheng P, Yothers G, Petersen L, Wickerham DL, Wolmark N, Ko CY. Cancer survivorship research: the challenge of recruiting adult long term cancer survivors from a cooperative clinical trials group. J Cancer Surviv. 2009 Sep; 3(3):137-47. PMID: 19526347.
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    159. SooHoo NF, Krenek L, Eagan MJ, Gurbani B, Ko CY, Zingmond DS. Complication rates following open reduction and internal fixation of ankle fractures. J Bone Joint Surg Am. 2009 May; 91(5):1042-9. PMID: 19411451.
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    160. Hall BL, Bilimoria KY, Ko CY. Investigations using clinical data registries: observational studies and risk adjustment. Surgery. 2009 Jun; 145(6):602-10. PMID: 19486759.
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    161. Yermilov I, McGory ML, Shekelle PW, Ko CY, Maggard MA. Appropriateness criteria for bariatric surgery: beyond the NIH guidelines. Obesity (Silver Spring). 2009 Aug; 17(8):1521-7. PMID: 19343019.
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    162. Soohoo NF, Lieberman JR, Farng E, Park S, Jain S, Ko CY. Perioperative quality-of-care measures for patients undergoing total hip or total knee replacement. J Long Term Eff Med Implants. 2009; 19(4):249-53. PMID: 21083530.
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    163. Chen JY, Malin J, Ganz PA, Ko C, Tisnado D, Tao ML, Timmer M, Adams JL, Kahn KL. Variation in physician-patient discussion of breast reconstruction. J Gen Intern Med. 2009 Jan; 24(1):99-104. PMID: 19023629.
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    164. Yermilov I, Bentrem D, Sekeris E, Jain S, Maggard MA, Ko CY, Tomlinson JS. Readmissions following pancreaticoduodenectomy for pancreas cancer: a population-based appraisal. Ann Surg Oncol. 2009 Mar; 16(3):554-61. PMID: 19002528.
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    165. Yermilov I, Jain S, Sekeris E, Bentrem DJ, Hines OJ, Reber HA, Ko CY, Tomlinson JS. Utilization of parenteral nutrition following pancreaticoduodenectomy: is routine jejunostomy tube placement warranted? Dig Dis Sci. 2009 Jul; 54(7):1582-8. PMID: 18958617.
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    166. Yermilov I, Chow W, Devgan L, Makary M, Ko CY. How to measure the quality of surgery-related web sites. Am Surg. 2008 Oct; 74(10):997-1000. PMID: 18942631.
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    167. Aranda MA, McGory M, Sekeris E, Maggard M, Ko C, Zingmond DS. Do racial/ethnic disparities exist in the utilization of high-volume surgeons for women with ovarian cancer? Gynecol Oncol. 2008 Nov; 111(2):166-72. PMID: 18829086.
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    168. Parikh JA, Ko CY, Maggard MA, Zingmond DS. What is the rate of small bowel obstruction after colectomy? Am Surg. 2008 Oct; 74(10):1001-5. PMID: 18942632.
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    169. Bilimoria KY, Bentrem DJ, Nelson H, Stryker SJ, Stewart AK, Soper NJ, Russell TR, Ko CY. Use and outcomes of laparoscopic-assisted colectomy for cancer in the United States. Arch Surg. 2008 Sep; 143(9):832-9; discussion 839-40. PMID: 18794419.
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    170. Pittman J, Rawl SM, Schmidt CM, Grant M, Ko CY, Wendel C, Krouse RS. Demographic and clinical factors related to ostomy complications and quality of life in veterans with an ostomy. J Wound Ostomy Continence Nurs. 2008 Sep-Oct; 35(5):493-503. PMID: 18794701.
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    171. Maggard MA, Yermilov I, Tomlinson JS, Ko CY. Are 12 nodes needed to accurately stage T1 and T2 colon cancers? Dig Dis Sci. 2009 Mar; 54(3):640-7. PMID: 18612817.
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    172. Yermilov I, Chow W, Devgan L, Makary MA, Ko CY. What is the quality of surgery-related information on the internet? Lessons learned from a standardized evaluation of 10 common operations. J Am Coll Surg. 2008 Oct; 207(4):580-6. PMID: 18926463.
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    173. Ko C. The natural history of diverticulitis: implications for elective surgery. J Gastrointest Surg. 2008 Aug; 12(8):1312-3. PMID: 18584261.
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    174. Bilimoria KY, Bentrem DJ, Merkow RP, Nelson H, Wang E, Ko CY, Soper NJ. Laparoscopic-assisted vs. open colectomy for cancer: comparison of short-term outcomes from 121 hospitals. J Gastrointest Surg. 2008 Nov; 12(11):2001-9. PMID: 18575941.
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    175. Bilimoria KY, Bentrem DJ, Feinglass JM, Stewart AK, Winchester DP, Talamonti MS, Ko CY. Directing surgical quality improvement initiatives: comparison of perioperative mortality and long-term survival for cancer surgery. J Clin Oncol. 2008 Oct 01; 26(28):4626-33. PMID: 18574159.
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    176. Parikh JA, McGory ML, Ko CY, Hines OJ, Tillou A, Hiatt JR. A structured conference program improves competency-based surgical education. Am J Surg. 2008 Aug; 196(2):273-9. PMID: 18558395.
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    177. SooHoo NF, Zingmond DS, Ko CY. Disparities in the utilization of high-volume hospitals for total knee replacement. J Natl Med Assoc. 2008 May; 100(5):559-64. PMID: 18507209.
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    178. Bilimoria KY, Balch CM, Bentrem DJ, Talamonti MS, Ko CY, Lange JR, Winchester DP, Wayne JD. Complete lymph node dissection for sentinel node-positive melanoma: assessment of practice patterns in the United States. Ann Surg Oncol. 2008 Jun; 15(6):1566-76. PMID: 18414952.
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    179. Bilimoria KY, Bentrem DJ, Ko CY, Stewart AK, Winchester DP, Talamonti MS, Halverson AL. Squamous cell carcinoma of the anal canal: utilization and outcomes of recommended treatment in the United States. Ann Surg Oncol. 2008 Jul; 15(7):1948-58. PMID: 18414951.
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    180. Ryoo JJ, Ko CY. Minimizing disparities in surgical care: a research focus for the future. World J Surg. 2008 Apr; 32(4):516-21. PMID: 18204986.
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    181. O'Connell JB, Maggard MA, Manunga J, Tomlinson JS, Reber HA, Ko CY, Hines OJ. Survival after resection of ampullary carcinoma: a national population-based study. Ann Surg Oncol. 2008 Jul; 15(7):1820-7. PMID: 18369675.
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    182. Bilimoria KY, Stewart AK, Winchester DP, Ko CY. The National Cancer Data Base: a powerful initiative to improve cancer care in the United States. Ann Surg Oncol. 2008 Mar; 15(3):683-90. PMID: 18183467.
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    183. Ryoo JJ, Jain S, Ko CY. Diminishing disparities: starting in our own backyards. Ann Surg Oncol. 2008 Mar; 15(3):674-6. PMID: 18095032.
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    184. Ko CY, Parikh J, Zingmond D. Secondary analyses of large population-based data sets: issues of quality, standards, and understanding. Ann Surg Oncol. 2008 Feb; 15(2):395-6. PMID: 18071826.
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    185. Leonardi MJ, McGory ML, Ko CY. Quality of care issues in colorectal cancer. Clin Cancer Res. 2007 Nov 15; 13(22 Pt 2):6897s-902s. PMID: 18006797.
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    186. Bilimoria KY, Bentrem DJ, Linn JG, Freel A, Yeh JJ, Stewart AK, Winchester DP, Ko CY, Talamonti MS, Sturgeon C. Utilization of total thyroidectomy for papillary thyroid cancer in the United States. Surgery. 2007 Dec; 142(6):906-13; discussion 913.e1-2. PMID: 18063075.
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    187. Bilimoria KY, Bentrem DJ, Tomlinson JS, Merkow RP, Stewart AK, Ko CY, Prystowsky JB, Talamonti MS. Quality of pancreatic cancer care at Veterans Administration compared with non-Veterans Administration hospitals. Am J Surg. 2007 Nov; 194(5):588-93. PMID: 17936418.
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    188. Parikh JA, Yermilov I, Jain S, McGory ML, Ko CY, Maggard MA. How much do standardized forms improve the documentation of quality of care? J Surg Res. 2007 Nov; 143(1):158-63. PMID: 17950087.
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    189. Schneider EC, Malin JL, Kahn KL, Ko CY, Adams J, Epstein AM. Surviving colorectal cancer : patient-reported symptoms 4 years after diagnosis. Cancer. 2007 Nov 01; 110(9):2075-82. PMID: 17849466.
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    190. Stavrakis AI, Ituarte PH, Ko CY, Yeh MW. Surgeon volume as a predictor of outcomes in inpatient and outpatient endocrine surgery. Surgery. 2007 Dec; 142(6):887-99; discussion 887-99. PMID: 18063073.
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    191. Parikh J, Yermilov I, McGory M, Jain S, Ko CY, Maggard M. Is high BMI associated with specific complications after laparoscopic Roux-en-Y gastric bypass? Am Surg. 2007 Oct; 73(10):959-62. PMID: 17983056.
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    192. SooHoo NF, Zingmond DS, Ko CY. Comparison of reoperation rates following ankle arthrodesis and total ankle arthroplasty. J Bone Joint Surg Am. 2007 Oct; 89(10):2143-9. PMID: 17908889.
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    193. Bilimoria KY, Stewart AK, Tomlinson JS, Gay EG, Ko CY, Talamonti MS, Bentrem DJ. Impact of adjuvant radiation on survival: a note of caution when using cancer registry data to evaluate adjuvant treatments. Ann Surg Oncol. 2007 Dec; 14(12):3321-7. PMID: 17899285.
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    194. Bilimoria KY, Tomlinson JS, Merkow RP, Stewart AK, Ko CY, Talamonti MS, Bentrem DJ. Clinicopathologic features and treatment trends of pancreatic neuroendocrine tumors: analysis of 9,821 patients. J Gastrointest Surg. 2007 Nov; 11(11):1460-7; discussion 1467-9. PMID: 17846854.
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    195. Leonardi MJ, McGory ML, Ko CY. Publicly available hospital comparison web sites: determination of useful, valid, and appropriate information for comparing surgical quality. Arch Surg. 2007 Sep; 142(9):863-8; discussion 868-9. PMID: 17875841.
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    196. McGory ML, Zingmond DS, Tillou A, Hiatt JR, Ko CY, Cryer HM. Negative appendectomy in pregnant women is associated with a substantial risk of fetal loss. J Am Coll Surg. 2007 Oct; 205(4):534-40. PMID: 17903726.
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    197. Bilimoria KY, Bentrem DJ, Merkow RP, Tomlinson JS, Stewart AK, Ko CY, Talamonti MS. Application of the pancreatic adenocarcinoma staging system to pancreatic neuroendocrine tumors. J Am Coll Surg. 2007 Oct; 205(4):558-63. PMID: 17903729.
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    198. Tomlinson JS, Jain S, Bentrem DJ, Sekeris EG, Maggard MA, Hines OJ, Reber HA, Ko CY. Accuracy of staging node-negative pancreas cancer: a potential quality measure. Arch Surg. 2007 Aug; 142(8):767-723; discussion 773-4. PMID: 17709731.
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    199. Ko C, Parikh J, Yermilov I, Tomlinson J. The surgeon's role in the quality of oncologic care. J Natl Compr Canc Netw. 2007 Jul; 5(6):565-7. PMID: 17674481.
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    200. McGory ML, Zingmond DS, Sekeris E, Ko CY. The significance of inadvertent splenectomy during colorectal cancer resection. Arch Surg. 2007 Jul; 142(7):668-74. PMID: 17638806.
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    201. Leonardi MJ, McGory ML, Ko CY. A systematic review of deep venous thrombosis prophylaxis in cancer patients: implications for improving quality. Ann Surg Oncol. 2007 Feb; 14(2):929-36. PMID: 17103259.
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    202. Ng TT, McGory ML, Ko CY, Maggard MA. Meta-analysis in surgery: methods and limitations. Arch Surg. 2006 Nov; 141(11):1125-30; discussion 1131. PMID: 17116806.
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    203. Liu JH, Zingmond DS, McGory ML, SooHoo NF, Ettner SL, Brook RH, Ko CY. Disparities in the utilization of high-volume hospitals for complex surgery. JAMA. 2006 Oct 25; 296(16):1973-80. PMID: 17062860.
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    204. Maggard MA, McGory ML, Ko CY. Development of quality indicators: lessons learned in bariatric surgery. Am Surg. 2006 Oct; 72(10):870-4. PMID: 17058724.
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    205. Leonardi MJ, McGory ML, Ko CY. The rate of bleeding complications after pharmacologic deep venous thrombosis prophylaxis: a systematic review of 33 randomized controlled trials. Arch Surg. 2006 Aug; 141(8):790-7; discussion 797-9. PMID: 16924087.
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    206. Soohoo NF, Zingmond DS, Lieberman JR, Ko CY. Optimal timeframe for reporting short-term complication rates after total knee arthroplasty. J Arthroplasty. 2006 Aug; 21(5):705-11. PMID: 16877157.
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    207. Kang H, O'Connell JB, Leonardi MJ, Maggard MA, McGory ML, Ko CY. Rare tumors of the colon and rectum: a national review. Int J Colorectal Dis. 2007 Feb; 22(2):183-9. PMID: 16845516.
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    208. Foster NM, McGory ML, Zingmond DS, Ko CY. Small bowel obstruction: a population-based appraisal. J Am Coll Surg. 2006 Aug; 203(2):170-6. PMID: 16864029.
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    209. Etzioni DA, Yano EM, Rubenstein LV, Lee ML, Ko CY, Brook RH, Parkerton PH, Asch SM. Measuring the quality of colorectal cancer screening: the importance of follow-up. Dis Colon Rectum. 2006 Jul; 49(7):1002-10. PMID: 16673056.
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    210. Maggard MA, McGory ML, Shekelle PG, Ko CY. Quality indicators in bariatric surgery: improving quality of care. Surg Obes Relat Dis. 2006 Jul-Aug; 2(4):423-9; discussion 429-30. PMID: 16925372.
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    211. Tomlinson JS, Ko CY. Patient satisfaction: an increasingly important measure of quality. Ann Surg Oncol. 2006 Jun; 13(6):764-5. PMID: 16614874.
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    212. Krouse RS, Mohler MJ, Wendel CS, Grant M, Baldwin CM, Rawl SM, McCorkle R, Rosenfeld KE, Ko CY, Schmidt CM, Coons SJ. The VA Ostomy Health-Related Quality of Life Study: objectives, methods, and patient sample. Curr Med Res Opin. 2006 Apr; 22(4):781-91. PMID: 16684439.
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    213. SooHoo NF, Lieberman JR, Ko CY, Zingmond DS. Factors predicting complication rates following total knee replacement. J Bone Joint Surg Am. 2006 Mar; 88(3):480-5. PMID: 16510811.
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    214. McGory ML, Zingmond DS, Sekeris E, Bastani R, Ko CY. A patient's race/ethnicity does not explain the underuse of appropriate adjuvant therapy in colorectal cancer. Dis Colon Rectum. 2006 Mar; 49(3):319-29. PMID: 16475031.
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    215. Malin JL, Ko C, Ayanian JZ, Harrington D, Nerenz DR, Kahn KL, Ganther-Urmie J, Catalano PJ, Zaslavsky AM, Wallace RB, Guadagnoli E, Arora NK, Roudier MD, Ganz PA. Understanding cancer patients' experience and outcomes: development and pilot study of the Cancer Care Outcomes Research and Surveillance patient survey. Support Care Cancer. 2006 Aug; 14(8):837-48. PMID: 16482448.
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    216. Rigberg DA, McGory ML, Zingmond DS, Maggard MA, Agustin M, Lawrence PF, Ko CY. Thirty-day mortality statistics underestimate the risk of repair of thoracoabdominal aortic aneurysms: a statewide experience. J Vasc Surg. 2006 Feb; 43(2):217-22; discussion 223. PMID: 16476589.
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    217. Rigberg DA, Zingmond DS, McGory ML, Maggard MA, Agustin M, Lawrence PF, Ko CY. Age stratified, perioperative, and one-year mortality after abdominal aortic aneurysm repair: a statewide experience. J Vasc Surg. 2006 Feb; 43(2):224-9. PMID: 16476591.
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    218. Soohoo NF, Zingmond DS, Lieberman JR, Ko CY. Primary total knee arthroplasty in California 1991 to 2001: does hospital volume affect outcomes? J Arthroplasty. 2006 Feb; 21(2):199-205. PMID: 16520207.
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    219. Hill LB, O'Connell JB, Ko CY. Colorectal cancer: epidemiology and health services research. Surg Oncol Clin N Am. 2006 Jan; 15(1):21-37. PMID: 16389148.
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    220. McGory ML, Maggard MA, Kang H, O'Connell JB, Ko CY. Malignancies of the appendix: beyond case series reports. Dis Colon Rectum. 2005 Dec; 48(12):2264-71. PMID: 16258711.
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    221. Zingmond DS, McGory ML, Ko CY. Hospitalization before and after gastric bypass surgery. JAMA. 2005 Oct 19; 294(15):1918-24. PMID: 16234498.
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    222. McGory ML, Shekelle PG, Rubenstein LZ, Fink A, Ko CY. Developing quality indicators for elderly patients undergoing abdominal operations. J Am Coll Surg. 2005 Dec; 201(6):870-83. PMID: 16310690.
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    223. Ko CY, Maggard M, Agustin M. Quality in surgery: current issues for the future. World J Surg. 2005 Oct; 29(10):1204-9. PMID: 16136282.
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    224. McGory ML, Zingmond DS, Nanayakkara D, Maggard MA, Ko CY. Negative appendectomy rate: influence of CT scans. Am Surg. 2005 Oct; 71(10):803-8. PMID: 16468523.
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    225. Amersi F, Agustin M, Ko CY. Colorectal cancer: epidemiology, risk factors, and health services. Clin Colon Rectal Surg. 2005 Aug; 18(3):133-40. PMID: 20011296.
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    226. McGory ML, Maggard MA, Ko CY. A meta-analysis of perioperative beta blockade: what is the actual risk reduction? Surgery. 2005 Aug; 138(2):171-9. PMID: 16153424.
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    227. Kang H, O'Connell JB, Maggard MA, Sack J, Ko CY. A 10-year outcomes evaluation of mucinous and signet-ring cell carcinoma of the colon and rectum. Dis Colon Rectum. 2005 Jun; 48(6):1161-8. PMID: 15868237.
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    228. Livingston EH, Ko CY. Effect of diabetes and hypertension on obesity-related mortality. Surgery. 2005 Jan; 137(1):16-25. PMID: 15614276.
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    229. Maggard MA, Lane KE, O'Connell JB, Nanyakkara DD, Ko CY. Beyond the clinical trials: how often is sentinel lymph node dissection performed for breast cancer? Ann Surg Oncol. 2005 Jan; 12(1):41-7. PMID: 15827777.
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    230. O'Connell JB, Maggard MA, Liu JH, Etzioni DA, Ko CY. Are survival rates different for young and older patients with rectal cancer? Dis Colon Rectum. 2004 Dec; 47(12):2064-9. PMID: 15657655.
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    231. Etzioni DA, Ponce NA, Babey SH, Spencer BA, Brown ER, Ko CY, Chawla N, Breen N, Klabunde CN. A population-based study of colorectal cancer test use: results from the 2001 California Health Interview Survey. Cancer. 2004 Dec 01; 101(11):2523-32. PMID: 15505783.
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    232. O'Connell JB, Maggard MA, Ko CY. Cancer-directed surgery for localized disease: decreased use in the elderly. Ann Surg Oncol. 2004 Nov; 11(11):962-9. PMID: 15525824.
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    233. O'Connell JB, Maggard MA, Ko CY. Colon cancer survival rates with the new American Joint Committee on Cancer sixth edition staging. J Natl Cancer Inst. 2004 Oct 06; 96(19):1420-5. PMID: 15467030.
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    234. O'connell JB, Maggard MA, Liu JH, Etzioni DA, Ko CY. A report card on outcomes for surgically treated gastrointestinal cancers: are we improving? J Surg Res. 2004 Oct; 121(2):214-21. PMID: 15501461.
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    235. Maggard MA, Zingmond D, O'Connell JB, Ko CY. What proportion of patients with an ostomy (for diverticulitis) get reversed? Am Surg. 2004 Oct; 70(10):928-31. PMID: 15529854.
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    236. Ko CY, Escarce JJ, Baker L, Klein D, Guarino C. Predictors for medical students entering a general surgery residency: National survey results. Surgery. 2004 Sep; 136(3):567-72. PMID: 15349103.
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    237. Miller JA, Rege RV, Ko CY, Livingston EH. Health care access and poverty do not explain the higher esophageal cancer mortality in African Americans. Am J Surg. 2004 Jul; 188(1):22-6. PMID: 15219480.
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    238. Amersi F, Stamos MJ, Ko CY. Palliative care for colorectal cancer. Surg Oncol Clin N Am. 2004 Jul; 13(3):467-77. PMID: 15236729.
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    239. Maggard MA, O'Connell JB, Ko CY. Updated population-based review of carcinoid tumors. Ann Surg. 2004 Jul; 240(1):117-22. PMID: 15213627.
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    240. O'Connell JB, Maggard MA, Liu JH, Etzioni DA, Livingston EH, Ko CY. Do young colon cancer patients have worse outcomes? World J Surg. 2004 Jun; 28(6):558-62. PMID: 15366745.
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    241. Liu JH, Etzioni DA, O'Connell JB, Maggard MA, Ko CY. The increasing workload of general surgery. Arch Surg. 2004 Apr; 139(4):423-8. PMID: 15078711.
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    242. Liu JH, Chen PW, Asch SM, Busuttil RW, Ko CY. Surgery for hepatocellular carcinoma: does it improve survival? Ann Surg Oncol. 2004 Mar; 11(3):298-303. PMID: 14993025.
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    243. Livingston EH, Ko CY. Socioeconomic characteristics of the population eligible for obesity surgery. Surgery. 2004 Mar; 135(3):288-96. PMID: 14976479.
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    244. Etzioni DA, Liu JH, Maggard MA, O'Connell JB, Ko CY. Workload projections for surgical oncology: will we need more surgeons? Ann Surg Oncol. 2003 Nov; 10(9):1112-7. PMID: 14597452.
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    245. Etzioni DA, Liu JH, O'Connell JB, Maggard MA, Ko CY. Elderly patients in surgical workloads: a population-based analysis. Am Surg. 2003 Nov; 69(11):961-5. PMID: 14627256.
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    246. Maggard MA, Beanes SR, Ko CY. Anal canal cancer: a population-based reappraisal. Dis Colon Rectum. 2003 Nov; 46(11):1517-23; discussion 1523-4; author reply 1524. PMID: 14605572.
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    247. Zingmond D, Maggard M, O'Connell J, Liu J, Etzioni D, Ko C. What predicts serious complications in colorectal cancer resection? Am Surg. 2003 Nov; 69(11):969-74. PMID: 14627258.
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    248. Liu JH, Etzioni DA, O'Connell JB, Maggard MA, Hiyama DT, Ko CY. Inpatient surgery in California: 1990-2000. Arch Surg. 2003 Oct; 138(10):1106-11; discussion 1111-2. PMID: 14557128.
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    249. Liu JH, Zingmond D, Etzioni DA, O'Connell JB, Maggard MA, Livingston EH, Liu CD, Ko CY. Characterizing the performance and outcomes of obesity surgery in California. Am Surg. 2003 Oct; 69(10):823-8. PMID: 14570356.
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    250. O'Connell JB, Maggard MA, Liu JH, Etzioni DA, Livingston EH, Ko CY. Rates of colon and rectal cancers are increasing in young adults. Am Surg. 2003 Oct; 69(10):866-72. PMID: 14570365.
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    251. Duffy JP, Maggard M, Hiyama DT, Atkinson JB, McFadden DW, Ko CY, Hines OJ. Laparoscopic Nissen fundoplication improves quality of life in patients with atypical symptoms of gastroesophageal reflux. Am Surg. 2003 Oct; 69(10):833-8. PMID: 14570358.
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    252. Duffy JP, Hines OJ, Liu JH, Ko CY, Cortina G, Isacoff WH, Nguyen H, Leonardi M, Tompkins RK, Reber HA. Improved survival for adenocarcinoma of the ampulla of Vater: fifty-five consecutive resections. Arch Surg. 2003 Sep; 138(9):941-8; discussion 948-50. PMID: 12963649.
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    253. Ko CY, Maggard M, Livingston EH. Evaluating health utility in patients with melanoma, breast cancer, colon cancer, and lung cancer: a nationwide, population-based assessment. J Surg Res. 2003 Sep; 114(1):1-5. PMID: 13678691.
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    254. Maggard MA, O'Connell JB, Liu JH, Etzioni DA, Ko CY. Sample size calculations in surgery: are they done correctly? Surgery. 2003 Aug; 134(2):275-9. PMID: 12947329.
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    255. Etzioni DA, Liu JH, Maggard MA, Ko CY. The aging population and its impact on the surgery workforce. Ann Surg. 2003 Aug; 238(2):170-7. PMID: 12894008.
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    256. Berger DH, Ko CY, Spain DA. Society of University Surgeons position statement on the volume-outcome relationship for surgical procedures. Surgery. 2003 Jul; 134(1):34-40. PMID: 12874580.
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    257. Liu JH, Etzioni DA, O'Connell JB, Maggard MA, Ko CY. Using volume criteria: do California hospitals measure up? J Surg Res. 2003 Jul; 113(1):96-101. PMID: 12943816.
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    258. Maggard MA, O'Connell JB, Lane KE, Liu JH, Etzioni DA, Ko CY. Do young breast cancer patients have worse outcomes? J Surg Res. 2003 Jul; 113(1):109-13. PMID: 12943818.
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    259. Maggard MA, Thompson JE, Ko CY. Why do breast cancer mortality rates vary across states? Am Surg. 2003 Jan; 69(1):59-62. PMID: 12575783.
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    260. Ko CY, Chang JT, Chaudhry S, Kominski G. Are high-volume surgeons and hospitals the most important predictors of in-hospital outcome for colon cancer resection? Surgery. 2002 Aug; 132(2):268-73. PMID: 12219022.
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    261. Livingston EH, Ko CY. Use of the health and activities limitation index as a measure of quality of life in obesity. Obes Res. 2002 Aug; 10(8):824-32. PMID: 12181392.
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    262. Livingston EH, Ko CY. Assessing the relative contribution of individual risk factors on surgical outcome for gastric bypass surgery: a baseline probability analysis. J Surg Res. 2002 Jun 01; 105(1):48-52. PMID: 12069501.
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    263. Ko C, Chaudhry S. The need for a multidisciplinary approach to cancer care. J Surg Res. 2002 Jun 01; 105(1):53-7. PMID: 12069502.
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    264. Ko CY, Sack J, Chang JT, Fink A. Reporting randomized, controlled trials: where quality of reporting may be improved. Dis Colon Rectum. 2002 Apr; 45(4):443-7. PMID: 12006922.
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