1 Durham Veterans Affairs Health Care System, Durham, North Carolina; Department of Medicine, Duke University, Durham, North Carolina. Electronic address: brian.sullivan3@va.gov.
2 Central Virginia Veterans Affairs Health Care System, Richmond, Virginia.
3 Durham Veterans Affairs Health Care System, Durham, North Carolina; Department of Medicine, Duke University, Durham, North Carolina.
4 National Gastroenterology and Hepatology Program, Veterans Health Administration, Washington, DC; Department of Medicine, University of Washington School of Medicine, Seattle, Washington.