1. Departments of Chemistry, Statistics, Family Medicine, Internal Medicine, and Comprehensive Cancer Center, University of Michigan, Ann Arbor, Michigan 48109, Department of Surgery, University of Michigan Medical Center, Ann Arbor, Michigan 48109, Dana-Farber Cancer Institute/Brighman and Woman’s Medical Center, Boston, Massachusetts 02115, Department of Gastroenterology, Hepatology & Nutrition, University of Texas MD Anderson Cancer Center, Houston, Texas 77030, Department of Gastroenterology, St....