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