1. Division of Gastroenterology, Boston Medical Center, Boston University School of Medicine, Boston, MA
2. National Heart, Lung, and Blood Institute's and Boston University's Framingham Heart Study, Framingham, MA
3. Department of Mathematics and Statistics, Boston University, Boston, MA
4. Cardiovascular Research Center, Massachusetts General Hospital, Boston, MA
5. Cardiology Division, Department of Medicine, University of Massachusetts Medical School, Worcester, MA
6. Division of Cardiology, Department of Medicine, University of Pittsburgh Medical Center Heart & Vascular Institute University of Pittsburgh, Pittsburgh, PA
7. Cardiology Section, Evans Department of Medicine, Boston University School of Medicine, Boston, MA
8. Radiology Department, Massachusetts General Hospital, Harvard Medical School, Boston, MA
9. Gastrointestinal Division, Department of Medicine, Liver Center, Massachusetts General Hospital, Harvard Medical School, Boston, MA
10. Department of Epidemiology, Boston University School of Public Health, Boston, MA