St. Luke's International University - Department of Gastroenterology, Tokyo Shinagawa Hospital - Department of Gastroenterology, Tokyo Medical University - Department of Gastroenterological Endoscopy, Tokyo Metropolitan Bokutoh Hospital - Department of Gastroenterology, The Tazuke Kofukai Medical Research Institute - Kitano Hospital, Department of Gastroenterology and Hepatology, University of Tokyo Graduate School of Medicine - Department of Gastroenterology, Nippon Medical School - Department of Gastroenterology, Hiroshima City Asa Citizens Hospital - Department of Gastroenterology, Saga Medical Center Koseikan - Department of Gastroenterology, St. Marianna University School of Medicine - Division of Gastroenterology and Hepatology, Nara City Hospital - Department of Gastroenterology and Gastroenterology, Nagoya University Hospital - Department of Endoscopy, National Hospital Organization Kyoto Medical Centre - Department of Gastroenterology, Komagome Hospital, Tokyo Metropolitan Cancer and Infectious Diseases Center - Department of Gastroenterology, Oita University - Department of Gastroenterology, Fukuoka University Chikushi Hospital - Department of Gastroenterology, Nippon Medical School - Chiba Hokusoh Hospital, Department of Gastroenterology, Japanese Red Cross Shizuoka Hospital - Department of Gastroenterology, Kawasaki Medical School General Medical Center - Division of Endoscopy and Ultrasonography, Niigata University Graduate School of Medical and Dental Sciences - Division of Gastroenterology, University of Miyazaki Hospital - Department of Gastroenterology and Hepatology, University of Tsukuba - Department of Gastroenterology, Toranomon Hospital - Department of Gastroenterology, Fujita Health University Hospital - Department of Emergency Medicine, Naha City Hospital - Department of Gastroenterology, Tokyo Saiseikai Central Hospital - Department of Internal Medicine, Shuto General Hospital - Department of Gastroenterology, Hirosaki University Hospital - Division of Endoscopy, Kumamoto University - Department of Gastroenterology, National Hospital Organization Medical Center - Department of Gastroenterology and Hepatology, Kyushu University - Department of Medicine and Clinical Science, Fukushima Medical University - Department of Gastroenterology, Iwate Medical University - Division of Gastroenterology, National Defense Medical College - Department of Internal Medicine, Kawasaki Medical School - Division of Endoscopy and Ultrasonography, Suita Municipal Hospital - Department of Gastroenterology and Hepatology, University of the Ryukyus Hospital - Department of Endoscopy, National Hospital Organization Kyushu Medical Center - epartment of Gastroenterology, Fukuoka University Hospital - Department of Gastroenterological Endoscopy, Kitasato University - Department of Gastroenterology, Akita University - Department of Gastroenterology and Neurology, Kagoshima University Graduate School of Medical and Dental Sciences - Digestive and Lifestyle Diseases, Tokyo Medical University - Department of Gastroenterological Endoscopy, National Center for Global Health and Medicine - Department of Gastroenterology and Hepatology, St. Luke's International University - Department of Gastroenterology, St. Luke's International University - Department of Gastroenterology, St. Luke's International University - Department of Gastroenterology, St. Luke's International University - Department of Gastroenterology, St. Luke's International University - Department of Gastroenterology, St. Luke's International Hospital - Department of Gastroenterology and Nippon Medical School - Department of Gastroenterology