1. Division of Gastroenterology and Hepatology, Department of Medicine, University of North Carolina at Chapel Hill
2. Cecil G. Sheps Center for Health Services Research, University of North Carolina at Chapel Hill
3. Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill
4. Division of Gastroenterology and Hepatology, Icahn School of Medicine at Mount Sinai, New York, New York
5. Department of Health Policy and Management, University of North Carolina at Chapel Hill
6. Division of General Medicine and Clinical Epidemiology, Department of Medicine, University of North Carolina at Chapel Hill