Tadayuki Oshima1, Hiroto Miwa2. 1. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Japan. t-oshima@hyo-med.ac.jp. 2. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Japan.