1. Department of Gastroenterology, Graduate School of Medicine University of Tokyo Tokyo Japan
2. Department of Endoscopy and Endoscopic Surgery, Graduate School of Medicine University of Tokyo Tokyo Japan
3. Department of Gastroenterology Cancer Institute Hospital of JFCR Tokyo Japan
4. Gastroentelogical Center Yokohama City University Medical Center Yokohama Japan
5. Department of Gastroenterology and Hepatology Tokyo Medical University Hachioji Medical Center Tokyo Japan
6. Division of Gastroenterology, Department of Medicine, School of Medicine Showa University Tokyo Japan
7. Department of Gastroenterology Kitasato University Hospital Sagamihara Japan
8. Department of Gastroenterology and Hepatology, Saitama Medical Center Saitama Medical University Saitama Japan
9. Department of Gastroenterology Asahi General Hospital Chiba Japan
10. Department of Gastroenterology Tokyo Medical University Hospital Tokyo Japan
11. Department of Gastroenterology Saitama Medical University International Medical Center Saitama Japan
12. Department of Gastroenterology Jichi Medical University Hospital Tochigi Japan
13. Department of Gastroenterology Teikyo University Mizonokuchi Hospital Kawasaki Japan
14. Department of Gastroenterology Nihon University Itabashi Hospital Tokyo Japan
15. Division of Gastroenterology and Hepatology, Department of Internal Medicine Toho University Ohashi Medical Center Tokyo Japan
16. Department of Gastroenterology, Graduate School of Medicine Juntendo University Tokyo Japan