1. From the National Gastroenterology and Hepatology Program, Veterans Health Administration, Washington, DC (J.A.D.); the Division of Gastroenterology, Department of Medicine, University of Washington School of Medicine, Seattle (J.A.D.); White River Junction Veterans Affairs Medical Center, White River Junction, VT (D.J.R.); and the Geisel School of Medicine at Dartmouth and the Dartmouth Institute, Hanover, NH (D.J.R.).