Affiliation: | Department of Internal Medicine, Division of Gastroenterology, Harbor-UCLA Medical Center, Torrance, California, USA;Department of Internal Medicine, Division of Gastroenterology, Harbor-UCLA Medical Center, Torrance, California, USA;Department of Surgery, Harbor-UCLA Medical Center, Torrance, California, USA;Department of Internal Medicine, Division of Gastroenterology, Harbor-UCLA Medical Center, Torrance, California, USA |