1. Department of Mathematics; United States Naval Academy; Annapolis; MD
2. Center for Outcomes Research; Saint Louis University School of Medicine; St. Louis; MO
3. Department of Surgery; Johns Hopkins University School of Medicine; Baltimore; MD
4. Hospital Israelita Albert Einstein, Universidade Positivo; Sao Paulo; Brazil
5. Department of Surgery; Dartmouth-Hitchcock Medical Center; Hanover; NH