Affiliation: | 1. Department of Gastroenterological Surgery, Oita University Faculty of Medicine, Oita, Japan;2. Department of Gastroenterology and Hepatology, The Jikei University School of Medicine, Tokyo, Japan;3. Department of Endoscopy, The Jikei University School of Medicine, Tokyo, Japan;4. Department of Surgery, Osaka university Graduate School of Medicine, Osaka, Japan;5. Third Department of Surgery, Toho University School of Medicine, Ohashi Medical Center, Tokyo, Japan |