1. Clinical Research Unit, National Hospital Organization Kurihama Medical and Addiction Center, Yokosuka, Kanagawa, Japan
2. Department of Gastroenterology, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan
3. Department of Health Promotion, National Institute of Public Health, Wako, Saitama, Japan
4. Division of Endoscopy, Shizuoka Cancer Center, Shizuoka, Shizuoka, Japan
5. Department of Gastroenterology, Endoscopy Division, National Cancer Center Hospital East, Kashiwa, Chiba, Japan
6. Endoscopy Division, National Cancer Center Hospital, Tokyo, Tokyo, Japan
7. Department of Gastroenterology, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaidō, Japan
8. Department of Gastroenterology, Ishikawa Prefectural Central Hospital, Kanazawa, Ishikawa, Japan
9. Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
10. Department of Surgery, National Hospital Organization, Osaka National Hospital, Osaka, Osaka, Japan
11. Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Okayama, Japan
12. Department of Gastroenterology, Kanagawa Cancer Center, Yokohama, Kanagawa, Japan
13. Department of Medicine, Division of Gastroenterology, Showa University Hospital, Tokyo, Tokyo, Japan
14. Department of Gastroenterology, Kumamoto Regional Medical Center, Kumamoto, Kumamoto, Japan
15. Division of Gastroenterology and Hepatology, Department of Internal Medicine, St. Marianna University School of Medicine, Kawasaki, Kanagawa, Japan
16. Department of Surgery, Keio University School of Medicine, Tokyo, Tokyo, Japan
17. Department of Gastroenterology, Tochigi Cancer Center, Utsunomiya, Tochigi, Japan
18. Department of Molecular-Targeting Cancer Prevention, Kyoto Prefectural University of Medicine, Kyoto, Kyoto, Japan
19. Department of Clinical Oncology, Kyoto University Hospital, Kyoto, Kyoto, Japan