Affiliation: | 1. Department of Endoscopy, Hiroshima University Hospital, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan;2. Department of Gastroenterology and Metabolism, Hiroshima University, Hospital, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan |