1. Department of Medicine Perelman School of Medicine University of Pennsylvania Philadelphia PA
2. Division of Gastroenterology and Hepatology Perelman School of Medicine University of Pennsylvania Philadelphia PA
3. Department of Medicine Corporal Michael J. Crescenz VA Medical Center Philadelphia PA
4. Division of Gastroenterology Leonard Davis Institute of Health Economics University of Pennsylvania Philadelphia PA
5. Center for Clinical Epidemiology and Biostatistics Department of Biostatistics, Epidemiology & Informatics Perelman School of Medicine, University of Pennsylvania Philadelphia PA
6. Division of Gastroenterology Baylor University Medical CenterBaylor Scott and White Health Dallas TX
7. Division of Digestive Health and Liver Diseases Department of Medicine University of Miami Miller School of Medicine Miami FL