1. Division of Gastroenterology, Department of Medicine, University of Pennsylvania, Philadelphia2Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia3Leonard Davis Institute of Healt
2. Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia3Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia
3. Division of Gastroenterology, Department of Medicine, University of Pennsylvania, Philadelphia2Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia
4. Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia4Division of General Internal Medicine, University of Pennsylvania, Philadelphia5Center for Health Equity Research and Promotion, Philadelphia VA Medical Center, Philadel
5. Department of Medicine, University of Pennsylvania, Philadelphia
6. Department of Veterans Affairs/Office of Public Health, Philadelphia, Pennsylvania
7. Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia3Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia8Division of Pulmonary, Allergy, and Criti
8. Division of Gastroenterology, Department of Medicine, University of Pennsylvania, Philadelphia9Gastroenterology Section, Philadelphia VA Medical Center, Philadelphia, Pennsylvania