1. Sano Hospital; Kobe Japan
2. Hiroshima University; Hiroshima Japan
3. Showa University; Northern Yokohama Hospital; Yokohama Japan
4. The Jikei University School of Medicine; Tokyo Japan
5. National Cancer Center Hospital; Tokyo Japan
6. Wada Clinic; Wakayama Japan
7. Takahiro Fujii Clinic; Tokyo Japan
8. National Cancer Center Hospital East; Kashiwa Japan
9. National Hospital Organization Tokyo Medical Center; Tokyo Japan
10. Tochigi Cancer Center; Utsunomiya Japan
11. Akasaka Endoscopic Clinic; Tokyo Japan
12. Shizuoka Cancer Center; Shizuoka Japan
13. Kyoto University; Kyoto Japan
14. Juntendo University; Tokyo Japan
15. The First Hospital of China Medical University; Shenyang China
16. Kurume University; Kurume Japan
17. St. Mary's Hospital; Kurume Japan
18. Kinki University; Osaka-Sayama Japan
19. Osaka Medical Center for Cancer and Cardiovascular Diseases; Osaka Japan
20. Machida Gastrointestinal Hospital; Osaka Japan
21. Kyoto Katsura Hospital; Kyoto Japan
22. Kyoto Prefectural University of Medicine; Kyoto Japan
23. Fujita Health University; Toyoake Japan
24. Terai Clinic; Tokyo Japan
25. Japanese Red Cross Akita Hospital; Akita Japan
26. Tokura Yamaguchi Clinic; Mishima Japan
27. Toho University; Tokyo Japan
28. Aomori Prefectural Central Hospital; Aomori Japan