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Osaka International Cancer Institute - Department of Gastrointestinal Oncology, Kobe City Medical Center General Hospital, Kyoto Second Red Cross Hospital - Department of Gastroenterology, Shizuoka Cancer Center, Kurashiki Central Hospital, Osaka Metropolitan University, Osaka International Cancer Institute, Ishikawa Prefectural Central Hospital, Hirosaki General Medical Center, Kansai Rosai Hospital, Tokyo Metropolitan Bokutoh Hospital, Japanese Red Cross Society, Aomori Prefectural Central Hospital, Sano Hospital, Tokushima University, Okayama University, Suita Municipal Hospital - Department of Gastroenterology and Hepatology, Sapporo Medical University, Keio University, Japan Institute for Health Security, University of Miyazaki, Tochigi Cancer Centre, Tonan Hospital, Fukushima Medical University, Nara City Hospital, Naha City Hospital, Sapporo City General Hospital, National Hospital Organization (NHO) - Hakodate National Hospital, Yokohama City University, Toyonaka Municipal Hospital, Osaka Rosai Hospital, National Hospital Organization Osaka National Hospital, Sapporo Medical University, Junpukai Health Maintenance Center Kurashiki, Kyoto Prefectural University of Medicine - Department of Molecular-Targeting Prevention, University of Tokyo and Gunma University