Kyoto University - Department of Therapeutic Oncology, Kitasato University - Department of Gastroenterology, National Institute of Public Health - Department of Health Promotion, National Cancer Center Hospital East - Department of Gastroenterology and Endoscopy, National Cancer Center Hospital - Endoscopy Division, Kyoto University - Department of Therapeutic Oncology, Kitasato University - Research and Development Center for New Frontiers, Hokkaido University Hospital - Division of Endoscopy, Kanazawa Medical Association, Tohoku University Graduate School of Medicine - Division of Gastroenterology, Shizuoka Cancer Center - Division of Endoscopy, National Hospital Organization (NHO) - Osaka National Hospital, Department of Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences - Department of Gastroenterology and Hepatology, Kanagawa Cancer Center - Department of Gastrointestinal Surgery, Showa Medical University - Division of Gastroenterology, Kumamoto Regional Medical Center - Department of Gastroenterology, St. Marianna University - Division of Gastroenterology and Hepatology, Keio University, Kawasaki Municipal Kawasaki Hospital - Department of Surgery, Tochigi Cancer Center - Department of Gastroenterology, Shizuoka Cancer Center - Department of Diagnostic Pathology, National Cancer Center, Japan - Exploratory Oncology Research and Clinical Trial Center, Kyoto Prefectural University of Medicine - Department of Molecular-Targeting Prevention, National Hospital Organization (NHO) - Kurihama Medical and Addiction Center, Clinical Research Unit and Independent