[1] Ohio State Univ, Ctr Comprehens Canc, Dept Surg, Div Surg Oncol, Columbus, OH 43210 USA
[2] Ohio State Univ, Wexner Med Ctr, Columbus, OH 43210 USA
[3] Univ Wisconsin, Sch Med & Publ Hlth, Madison, WI 53706 USA
[4] Indiana Univ Sch Med, Div Surg Oncol, Indianapolis, IN 46202 USA
[5] Moi Teaching & Referral Hosp, Eldoret, Kenya
[6] Univ Wisconsin, Div Endocrine Surg, Madison, WI 53706 USA