1. Department of Gastroenterology, Toyonaka Municipal Hospital, Toyonaka-shi, Osaka, Japan
2. Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
3. Gastroenterological Endoscopy, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan
4. Department of Gastroenterology and Hepatology, National Center for Global Health and Medicine, Shinjuku-ku, Tokyo, Japan
5. Department of Gastroenterology, Nagasaki Harbor Medical Center, Nagasaki-shi, Nagasaki, Japan
6. Department of Gastroenterology, Fukui Prefectural Hospital, Fukui-shi, Fukui, Japan
7. Department of Gastroenterology, St. Luke's International Hospital, Chuo-ku, Tokyo, Japan
8. Department of Gastroenterology, Ishikawa Prefectural Central Hospital, Kanazawa-shi, Ishikawa, Japan
9. Department of Gastroenterology, Tonan Hospital, Sapporo-shi, Hokkaido, Japan
10. Department of Gastroenterology, Otaru Ekisaikai Hospital, Otaru-shi, Hokkaido, Japan
11. Department of Gastroenterology, Sapporo Century Hospital, Sapporo-shi, Hokkaido, Japan
12. Department of Gastroenterology, Shuto General Hospital, Yanai-shi, Yamaguchi, Japan
13. Department of Gastroenterology and Hepatology, National Center for Global Health and Medicine Kohnodai Hospital, Ichikawa-shi, Chiba, Japan
14. Department of Gastroenterology, Japan Community Healthcare Organization Osaka Hospital, Osaka-shi, Osaka, Japan
15. Department of Information and Computer Technology, Faculty of Engineering, Tokyo University of Science, Tokyo, Japan
16. Department of Gastroenterology and Hepatology, Nagoya University Graduate School of Medicine, Nagoya-shi, Aichi, Japan