Kurashiki Central Hospital, Sapporo Medical University, Shiga University of Medical Science, Kyoto University, Yokohama City University, Tokyo Women's Medical University, Kyoto University, Wakayama Medical University, Kindai University - Department of Gastroenterology and Hepatology, Fukuoka University Chikushi Hospital, Sanda City Hospital, Tohoku University, Fujita Health University, Sapporo Medical University, Kyoto Katsura Hospital, Nagoya University, University of Toyama, Kurashiki Central Hospital, Kurashiki Central Hospital, Kurashiki Central Hospital, Kyoto University, Kyoto University - Kyoto University Hospital, Wakayama Medical University - Second Department of Surgery, Kansai Medical University, Kindai University, Kansai Medical University, Kurashiki Central Hospital and Independent