Affiliation: | 1 Fox Chase Cancer Center, Philadelphia, Pennsylvania;2 VA Tennessee Valley Healthcare System, Vanderbilt University, Nashville, Tennessee;3 University of Michigan Ann Arbor, Michigan;4 Department of Veterans Affairs Medical Center, Gastroenterology Section, North Florida/South Georgia Veterans Health System, Division of Gastroenterology, Hepatology, and Nutrition, University of Florida, Gainesville, Florida;5 Minneapolis Veterans Affairs Health System, University of Minnesota, Minneapolis, Minnesota |