1. Endoscopy Center; Tokyo Medical University; Tokyo Japan
2. Third Department of Internal Medicine; Kyorin University School of Medicine; Tokyo Japan
3. Division of Gastroenterology and Hepatology; Department of Internal Medicine; Keio University School of Medicine; Tokyo Japan
4. Department of Gastroenterology; Juntendo University School of Medicine; Tokyo Japan
5. Department of Gastrointestinal Endoscopy; Tama-Nagayama University Hospital of Nippon Medical School; Tokyo Japan
6. Division of Gastroenterology; National Hospital Organization Tokyo Medical Center; Tokyo Japan
7. Yotsuya Medical Cube; Nerima General Hospital; Tokyo Japan
8. Department of Surgery; Nerima General Hospital; Tokyo Japan
9. Department of Internal Medicine; St. Luke's International Hospital; Tokyo Japan
10. Department of Gastroenterology and Hepatology; Nihon University, School and Medicine; Tokyo Japan
11. Torii Medical Clinic; Foundation for Detection of Early Gastric Cancer; Tokyo Japan
12. Department of General Medicine & Primary Care; Tokyo Medical University; Tokyo Japan
13. Department of Gastroenterology and Hepatology; Jikei University Kashiwa Hospital; Chiba Japan
14. Department of Gastroenterology; Tokai University School of Medicine; Kanagawa Japan
15. Foundation for Detection of Early Gastric Cancer; Tokyo Japan