Affiliation: | 1. Division of Gastroenterology and Hepatology, Stanford University Medical Center, Stanford, California;5. Division of Medical Oncology, Stanford University Medical Center, Stanford, California;3. Division of Gastroenterology and Hepatology, Veterans Affairs Palo Alto Health Care System, Palo Alto, California;4. Department of Internal Medicine, Detroit Medical Center/Wayne State University, Detroit, Michigan;6. Department of Medicine, Stanford University School of Medicine, Stanford, California |