1. General Surgery Department, Brooke Army Medical Center, 3551 Roger Brooke Drive, JBSA FSH, TX 770234.
2. Department of Surgery, University of Texas Health Science Center San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229.
3. Department of Statistics, Brooke Army Medical Center, 3551 Roger Brooke Drive, JBSA FSH, TX 770234.
4. Department of Surgery, Travis Air Force Base, 690 Airman Drive, CA 94535.