[1] Rocky Vista Univ, Dept Specialty Med, Coll Osteopath Med, 8401 S Chambers Rd, Parker, CO 80134 USA
[2] Med Ctr Aurora, 1501 S Potomac St, Aurora, CO 80012 USA
[3] Univ Pavia, Dept Clin Surg Diagnost & Pediat Sci, Policlin San Matteo, I-27100 Pavia, Italy
[4] Univ Lincoln, Lincoln Int Business Sch, Lincoln LN6 7TS, Lincs, England
[5] Univ Edinburgh, Royal Infirm, Dept Gen Surg, Edinburgh EH16 4SA, Midlothian, Scotland
[6] Med Univ Plovdiv RIMU, Univ Hosp St George UMHAT, Clin Gen Surg 1, Res Inst, Plovdiv 4000, Bulgaria
[7] Univ Campinas Unicamp, Dept Surg, Sch Med Sci SMS, BR-13 08397 Campinas, SP, Brazil
[8] Scripps Mem Hosp, Div Trauma & Acute Care Surg, La Jolla, CA 92037 USA
[9] Osped Maurizio Bufalini, Dept Gen & Emergency Surg, AUSL Romagna, I-47521 Cesena, Italy