Earnshaw SR, Kauf TL, McDade C, Potashman MH, Pauyo C, Reese ES, Senagore A. Economic impact of alvimopan considering varying definitions of postoperative ileus. J Am Coll Surg. 2015 Nov;221(5):941-50. doi: 10.1016/j.jamcollsurg.2015.08.004
Inabnet WB3rd, Winegar DA, Sherif BN, Sarr MG. Early outcomes of bariatric surgery in patients with metabolic syndrome: an analysis of the bariatric outcomes longitudinal database. J Am Coll Surg. 2012 Apr;214(4):550-6.
Williams VSL. The "unbiased" anchor: bridging the gap between DIF and item bias. Appl Meas Educ. 1997;10(3):253-67. doi: 10.1207/s15324818ame1003_4