1. Division of Gastroenterology and Hepatology University of Washington Seattle Washington USA
2. Division of Gastroenterology Veterans Affairs Puget Sound Health Care System Seattle Washington USA
3. Division of Gastroenterology and Hepatology The University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
4. Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
5. Hospital and Specialty Medicine, Veterans Affairs Puget Sound Health Care System Seattle Washington USA
6. Division of General Internal Medicine University of Washington School of Medicine Seattle Washington USA
7. Health Service Research and Development, Veterans Affairs Puget Sound Health Care System Seattle Washington USA