1. Division of Gastroenterology and Hepatology, University of Colorado Anschutz School of Medicine, and Division of Gastroenterology and Hepatology, Rocky Mountain Regional Veterans Affairs Medical Center, Aurora, Colorado (S.G.P.)
2. Gastroenterology Section, Veterans Affairs Puget Sound Health Care System, and Division of Gastroenterology, University of Washington, Seattle, Washington (J.A.D.)