1. General Surgery Residency Program, Dwight D. Eisenhower Army Medical Center , Fort Eisenhower, GA 30905, USA
2. General Surgery Residency Program, Walter Reed National Military Medical Center , Bethesda, MD 20889, USA
3. Department of General Surgery, John Cochran VA Medical Center , St. Louis, MO 63106, USA
4. Department of General Surgery, Dwight D. Eisenhower Army Medical Center , Fort Eisenhower, GA 30905, USA