1. Department of Surgery, International University of Health and Welfare
2. Division of Molecular Epidemiology, The Jikei University School of Medicine
3. Yoshida Hospital
4. Kyoto Kujo Hospital
5. Naganuma Municipal Hospital
6. PEG Center, Oita Kensei Hospital
7. Onishi Hospital
8. Center for Gastroenterology, Sapporo Higashi-Tokushukai Hospital
9. Higashi Washinomiya Hospital
10. Baba Memorial Hospital
11. Kiyota Hospital
12. Osaka City General Hospital
13. Nishiyama Clinic
14. Tsuruoka Kyoritsu Hospital
15. Department of Internal Medicine, Nishimino Kosei Hospital
16. Nara Prefectural Gojo Hospital
17. Endoscopic Treatment Center, Japan Labour Health and Welfare Organization
18. Johoku Hospital
19. Haramachi Red-Cross Hospital
20. Isesaki Municipal Hospital
21. Maebashi Red Cross Hospital
22. Hirano General Hospital
23. JA Nigata, Joetsu General Hospital
24. Kimura Hospital
25. Social Insurance Shimonoseki Welfare Hospital
26. Sapporo Shirakaba-dai Hospital
27. Digestive Endoscopy Center, Sendai Kousei Hospital
28. Kusatsu General Hospital
29. Chitose City Hospital
30. Kohka Public Hospital
31. TACHIKAWA Medical Center
32. Koma Kyoritu Hospital
33. Sunami Syusaikai Hospital
34. Bizen Cities' Yoshinaga Hospital
35. Sendai City Medical Center
36. Matsue Seikyo Genaral Hospital
37. Tsuyama Chuo Hospital
38. Toyosaka Hospital
39. Okayama Kyoritsu Hospital