Eiichiro Yasutomi1, Yoshihiko Yano2, Yuzo Kodama2. 1. Division of Gastroenterology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan. Electronic address: eiichiro_yasutomi@yahoo.co.jp. 2. Division of Gastroenterology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan.