1. Department of Gastroenterology Graduate School of Medicine The University of Tokyo
2. Department of Oncologic Pathology Dana‐Farber Cancer Institute and Harvard Medical School Boston USA
3. Department of Gastroenterology Graduate School of Medicine Juntendo University
4. First Department of Internal Medicine Gifu University Hospital
5. Department of Gastroenterology Japanese Red Cross Medical Center
6. Department of Gastroenterology Gifu Municipal Hospital Gifu
7. Department of Gastroenterology Tokyo Metropolitan Police Hospital
8. Department of Gastroenterology JR Tokyo General Hospital
9. Department of Gastroenterology Kanto Central Hospital
10. Department of Gastroenterology Saitama Medical University International Medical Center Saitama
11. Department of Gastroenterology JCHO Tokyo Takanawa Hospital
12. Department of Gastroenterology Toshiba General Hospital Tokyo
13. Department of Gastroenterology Teikyo University Mizonokuchi Hospital Kanagawa Japan