1. Department of Gastrointestinal Oncology Osaka International Cancer Institute Osaka Japan
2. Department of Gastroenterological and General Surgery Kyorin University School of Medicine Tokyo Japan
3. Department of Gastrointestinal Endoscopy NTT Medical Center Tokyo Tokyo Japan
4. Department of Gastroenterology Imamura Hospital Saga Japan
5. Endoscopy Division Yokohama City University Medical Center Kanagawa Japan
6. Department of Gastroenterology Iwate Prefectural Isawa Hospital Iwate Japan
7. Department of Gastroenterology and Neurology, Faculty of Medicine Kagawa University Kagawa Japan
8. Gastroenterology and Hepatology Osaka Red Cross Hospital Osaka Japan
9. Department of Gastroenterology Akashi Medical Center Hyogo Japan
10. Department of Gastroenterology Omori Red Cross Hospital Tokyo Japan
11. Endoscopy Division Shizuoka Cancer Center Shizuoka Japan
12. Department of Gastroenterology Ehime Rosai Hospital Ehime Japan