1. Section of GastroenterologyBoston Medical CenterBoston University School of Medicine Boston Massachusetts
2. Department of Biostatistics Boston University Boston Massachusetts
3. Population Sciences Branch National Heart, Lung, and Blood Institute National Institutes of Health Bethesda Maryland
4. Radiology Department Massachusetts General Hospital Harvard Medical School Boston Massachusetts
5. Liver Center Gastrointestinal Division Department of Medicine Massachusetts General Hospital Harvard Medical School Boston Massachusetts
6. Department of Epidemiology Boston University School of Public Health Boston Massachusetts
7. Evans Department of Medicine Whitaker Cardiovascular Institute and Cardiology Section Boston University School of Medicine Boston Massachusetts
8. Division of Gastroenterology Department of Medicine and Division of Epidemiology Department of Family and Preventive University of California at San Diego La Jolla California