1. Division of Gastroenterology, Hospital and Specialty Medicine Service, Veterans Affairs Puget Sound Healthcare System and University of Washington, Seattle, Washington, USA
2. Division of Gastroenterology, Department of Medicine, University of Washington, Seattle, Washington, USA
3. Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles, California, USA
4. Greater Los Angeles Veterans Affairs Medical Center, Los Angeles, California, USA
5. Department of Medicine (Gastroenterology and Hepatology), VA Palo Alto Health Care System, Palo Alto, California, USA
6. Department of Medicine, Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, California
7. Digestive Disease Section, Cincinnati VA Medical Center, Cincinnati, Ohio, USA
8. Department of Internal Medicine, Gastroenterology Section, Veterans Affairs, Ann Arbor Healthcare System, Ann Arbor, Michigan, USA
9. Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
10. Division of Gastroenterology, Veterans Affairs Wilmington Health Care, Wilmington, Delaware, USA
11. Section of Digestive Diseases, VA Connecticut Health Care System, West Haven, Connecticut, USA
12. Gastroenterology Section, VA San Diego Health Care System, San Diego, California, USA
13. Gastroenterology Service, VA Long Beach Health Care System, Long Beach, California, USA
14. Dallas VA Medical Center, Dallas, Texas, USA
15. Division of Gastroenterology, Department of Internal Medicine, Hepatology and Nutrition, Virginia Commonwealth University and Central Virginia Veterans Health Care System, Richmond, Virginia, USA
16. Center for Health Equity Research and Promotion, VA Pittsburgh Health Care System, Pittsburgh, Pennsylvania, USA
17. Departments of Medicine and Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, USA