1. Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
2. Center for Health Equity Research and Promotion, VA Pittsburgh Healthcare System, Pittsburgh, Pennsylvania, USA
3. Gastroenterology Section, VA Long Beach Healthcare System, Long Beach, California, USA
4. Pharmacy Benefits Management, Veterans Integrated Service Network 20, Vancouver, Washington, USA
5. Pharmacy Benefits Management, Veterans Integrated Service Network 8, Bay Pines, Florida, USA
6. Division of Gastroenterology, Hepatology, and Nutrition, Virginia Commonwealth University, Richmond, Virginia, USA
7. VA Richmond Health Care System, Richmond, Virginia, USA
8. Gastroenterology and Hepatology, VA Portland Health Care System, Portland, Oregon, USA
9. VA Puget Sound Health Care System, Seattle, Washington, USA
10. Division of Gastroenterology, University of Washington School of Medicine, Seattle, Washington, USA
11. Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, USA