Yokohama City University, Kyoto Prefectural University, Kyoto Prefectural University of Medicine, Hamamatsu University, Yokohama City University - Department of Gastroenterology and Hepatology, Yokohama City University - Department of Gastroenterology and Hepatology, Kanagawa Dental University Yokohama Clinic, Yokohama Sakae Kyosai Hospital, Shonan Hospital Yokosuka, Namiki Koiso-Medical Clinic, Kanagawa Dental University Yokohama Clinic, Saga-ken Medical Centre, Loco Medical General Institute, Saga University Hospital, Saga University Hospital, Saga University, Saga University Hospital, Karatsu Red Cross Hospital, Masuda Red Cross Hospital, Fujioka General Hospital, Hamamatsu University, Hamamatsu University, Iwata City Hospital, Shimada General Medical Center, Seirei Mikatahara General Hospital, Seirei Hamamatsu General Hospital, Izumo City General Medical Center, Kitasenri Maeda Clinic, National Hospital Organization (NHO) - Yokohama Medical Center, Mie University, Osaka University, Osaka University, Musashino Red Cross Hospital - Department of Gastroenterology and Hepatology, Mie University, Kurume University - Division of Gastroenterology, Kyoto Prefectural University of Medicine - Department of Molecular Gastroenterology and Hepatology, Okayama University, Saga University - Center for Comprehensive Community Medicine, International University of Health and Welfare, Tokyo - International University of Health and Welfare Graduate School, Yokohama City University and Saga University - Division of Metabolism and Endocrinology