Noriko Inomata1, Arata Sakai2, Shohei Abe1, Yuzo Kodama1. 1. Division of Gastroenterology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Japan. 2. Division of Gastroenterology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Japan. Electronic address: asakai@med.kobe-u.ac.jp.