1. Center for Clinical Management Research, Department of Veterans Affairs, VA Ann Arbor Healthcare System, Ann Arbor, Michigan2Department of Internal Medicine, University of Michigan Health System, Ann Arbor
2. Center for Clinical Management Research, Department of Veterans Affairs, VA Ann Arbor Healthcare System, Ann Arbor, Michigan
3. Department of Veterans Affairs, VA Puget Sound Health Care System, Seattle, Washington4Division of Gastroenterology, University of Washington School of Medicine, Seattle