Affiliation: | 1. Department of Medicine, Corporal Michael J. Crescenz VA Medical Center, Philadelphia, Pennsylvania;3. Department of Medicine, Division of Gastroenterology and Hepatology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania;4. Department of Medicine, Bruce W Carter VA Medical Center, Miami, Florida;5. Department of Medicine, San Francisco VA Medical Center, San Francisco, California;7. Department of Medicine, Boston VA Healthcare System, Boston, Massachusetts;12. Department of Medicine, James J. Peters VA Medical Center, Bronx, New York;8. Department of Medicine, Minneapolis VA Medical Center, Minneapolis, Minnesota |