1. Department of Therapeutic Oncology Graduate School of Medicine, Kyoto University Kyoto Japan
2. Department of Health and Promotion National Institute of Public Health Saitama Japan
3. Department of Gastroenterology and Endoscopy National Cancer Center Hospital East Chiba Japan
4. Endoscopy Division National Cancer Center Hospital Tokyo Japan
5. Department of Gastroenterology Kitasato University School of Medicine Kanagawa Japan
6. Division of Endoscopy Hokkaido University Hospital Hokkaido Japan
7. Department of Gastroenterology Ishikawa Prefectural Central Hospital Ishikawa Japan
8. Division of Gastroenterology Tohoku University Graduate School of Medicine Miyagi Japan
9. Division of Endoscopy Shizuoka Cancer Center Shizuoka Japan
10. Department of Surgery National Hospital Organization Osaka National Hospital Osaka Japan
11. Department of Practical Gastrointestinal Endoscopy Faculty of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University Okayama Japan
12. Department of Gastroenterology Kanagawa Cancer Center Kanagawa Japan
13. Department of Medicine, Division of Gastroenterology Showa University Hospital Tokyo Japan
14. Department of Gastroenterology Kumamoto Regional Medical Center Kumamoto Japan
15. Division of Gastroenterology, Department of Internal Medicine St. Marianna University School of Medicine Kanagawa Japan
16. Department of Surgery Kawasaki Municipal Kawasaki Hospital Kanagawa Japan
17. Department of Gastroenterology Tochigi Cancer Center Tochigi Japan
18. Department of Otolaryngology‐Head and Neck Surgery Kyoto University Hospital Kyoto Japan
19. Department of Otorhinolaryngology‐Head and Neck Surgery Kitasato University School of Medicine Kanagawa Japan
20. Department of Public Health Wakayama Medical University School of Medicine Wakayama Japan
21. Department of Head and Neck Surgery National Cancer Center Hospital East Chiba Japan
22. Department of Molecular‐Targeting Prevention Kyoto Prefectural University of Medicine Kyoto Japan
23. Clinical Research Unit National Hospital Organization Kurihama Medical and Addiction Center Kanagawa Japan