1Department of Gastroenterology and Hepatology, Graduate School of Medicine, Kyoto University, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507 Japan
2Department of Gastroenterology and Hepatology, Kyorin University School of Medicine, Mitaka-shi, Tokyo 181-8611 Japan
3Section of Clinical Epidemiology, Department of Community Medicine, Graduate School of Medicine, Kyoto University, Kyoto, 606-8507 Japan
4Division of Gastroenterology, Department of Internal Medicine, Asahikawa Medical University, Asahikawa, 078-8510 Japan
5Department of Gastroenterology and Hepatology, Tokyo Medical and Dental University, Tokyo, 113-8519 Japan
6Department of Medicine, Shiga University of Medical Science, Otsu, 520-2192 Japan
7Department of Gastroenterology, Juntendo University School of Medicine, Tokyo, 113-8421 Japan
8Department of Advanced Endoscopy, Fujita Health University School of Medicine, Toyoake, 470-1192 Japan
9Division of Gastroenterology, Department of Internal Medicine, Graduate School of Medicine, Kobe University, Kobe, 650-0017 Japan
10Department of Gastroenterology, Nara Prefecture General Medical Center, Nara, 630-8581 Japan
11Department of Gastroenterology, Institute of Medicine, University of Tsukuba, Tsukuba, 305-8576 Japan
12Division of Gastroenterology, Department of Internal Medicine, Aichi Medical University School of Medicine, Nagakute, 480-1195 Japan
13Inflammatory Bowel Disease Center, Yokohama City University Medical Center, Yokohama, 232-0024 Japan
14Department of Gastroenterology and Hepatology, Dentistry and Pharmaceutical Sciences, Okayama University Graduate School of Medicine, Okayama, 700-8558 Japan
15Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, 602-8566 Japan
16Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871 Japan
17Department of Gastroenterology, Faculty of Medicine, Fukuoka University, Fukuoka, 814-0180 Japan
18Second Department of Internal Medicine, Osaka Medical and Pharmaceutical University, Takatsuki, 569-8686 Japan
19Division of Gastroenterology, Department of Internal Medicine, Faculty of Medicine, Saga University, Saga, 849-8501 Japan
20Department of Gastroenterology and Hepatology, Sapporo Medical University School of Medicine, Sapporo, 060-8543 Japan
21Center for Gastroenterology, Urasoe General Hospital, Urasoe, 901-2102 Japan
22Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, 812-8582 Japan
23Division of Digestive and Lifestyle Diseases, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, 890-8520 Japan
24Department of Internal Medicine, National Defence Medical College, Tokorozawa, 359-8513 Japan
25Division of Gastroenterology and Hepatology, Department of Internal Medicine, Toho University Sakura Medical Center, Sakura, 285-8741 Japan
26Department of Gastroenterology and Hematology, Hirosaki University Graduate School of Medicine, Hirosaki, 036-8563 Japan
27Department of Gastroenterology, Kitasato University School of Medicine, Kanagawa, 252-0375 Japan
28Division of Gastroenterology and Hepatology, Third Department of Internal Medicine, Kansai Medical University, Osaka, 573-1010 Japan
29Division of Internal Medicine, Department of Gastroenterology and Hepatology, The Jikei University School of Medicine, Tokyo, 105-8471 Japan
30Department of Gastroenterology and Hepatology, Kansai Electric Power Hospital, Fukushima-ku, Osaka, 553-0003 Japan