1. Department of Gastroenterology and Endoscopy National Cancer Center Hospital East Chiba Japan
2. Department of Gastrointestinal Oncology Osaka International Cancer Institute Osaka Japan
3. Division of Gastroenterology Tohoku University Graduate School of Medicine Miyagi Japan
4. Division of Endoscopy Shizuoka Cancer Center Shizuoka Japan
5. Department of Gastroenterology and Hepatology Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Okayama Japan
6. Department of Gastroenterology Toranomon Hospital Tokyo Japan
7. Department of Gastroenterology Fukuoka University Chikushi Hospital Fukuoka Japan
8. Endoscopy Division National Cancer Center Hospital Tokyo Japan
9. Department of Gastrointestinal Oncology Hyogo Cancer Center Hyogo Japan
10. Department of Gastroenterology Cancer Institute Hospital Tokyo Japan
11. Division of Regeneration and Medicine Center for Translational and Clinical Research Hiroshima University Hospital Hiroshima Japan
12. Department of Gastroenterology and Hepatology Nagasaki University Hospital Nagasaki Japan
13. Department of Gastroenterology Osaka City University Graduate School of Medicine Osaka Japan
14. Department of Gastroenterology Tokyo Metropolitan Cancer and infectious Diseases Center Komagome Hospital Tokyo Japan
15. Department of Gastroenterology Keiyukai Daini Hospital Hokkaido Japan
16. Department of Endoscopy Saku Central Hospital Advanced Care Center Nagano Japan