1. From the Division of Digestive Diseases and Nutrition, University of Kentucky Medical Center, Lexington, Kentucky (C-JT); the Channing Laboratory, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA (C-JT, WCW, and ELG); the Departments of Nutrition and Epidemiology, Harvard School of Public Health, Boston, MA (WCW and ELG); and the Division of Cancer Epide