Sapporo Medical University, Sapporo Medical University, Kitasato University - Center for Advanced IBD Research and Treatment, Iwate Medical University - Division of Gastroenterology, Saga University, Toyama University Hospital, Yokohama City University, Fukuoka University Chikushi Hospital, National Center for Child Health and Development, Gifu University, Juntendo University, Kyushu University, Hirosaki University, Asahikawa Medical University, Kitasato University, Jikei University, National Defense Medical College, Niigata University, University of Tokyo, University of Tokyo, Kyorin University School of Medicine - Department of Gastroenterology and Hepatology and Independent