1. Division of Gastroenterology and Hepatology Perelman School of Medicine University of Pennsylvania Philadelphia PA
2. Leonard David Institute of Health Economics University of Pennsylvania Philadelphia PA
3. Division of Gastroenterology, Hepatology, and Nutrition Beth Israel Deaconess Medical CenterHarvard Medical School Boston MA
4. Center for Clinical Epidemiology and Biostatistics Department of Biostatistics Epidemiology & Informatics Perelman School of Medicine University of Pennsylvania Philadelphia PA
5. Division of Gastroenterology Department of Medicine Veterans Affairs Puget Sound Healthcare System and University of Washington Seattle WA
6. Health Services Research and Development Veterans Affairs Puget Sound Healthcare System Seattle WA
7. Division of Digestive Diseases Yale University School of Medicine New Haven CT
8. VA Connecticut Healthcare System West Haven CT
9. Department of Medicine Corporal Michael J. Crescenz VA Medical Center Philadelphia PA
10. Division of Digestive Health and Liver Diseases Department of Medicine University of Miami Miller School of Medicine Miami FL