1. Division of Endoscopy; Hokkaido University Hospital; Sapporo; Japan
2. Department of Gastroenterology; Kakogawa West City Hospital; Hyogo; Japan
3. Department of Clinical Nursing; Shimane University Faculty of Medicine,; Shimane; Japan
4. Department of Medicine, Gastroenterology and Health-care; Social Insurance Shiga Hospital; Shiga; Japan
5. Department of Gastroenterology; Social Insurance Kyoto Hospital; Kyoto; Japan
6. Department of Gastroenterology; Japanese Red Cross Kyoto Daiichi Hospital; Kyoto; Japan
7. Department of Gastrointestinal Oncology; Osaka Medical Center for Cancer and Cardiovascular Diseases; Osaka; Japan
8. Department of General Medicine, Faculty of Medicine; Oita University; Oita; Japan
9. Department of Gastroenterology; Tohoku Rosai Hospital; Sendai; Japan
10. Department of Medicine and Molecular Science,; Hiroshima University; Hiroshima; Japan
11. Department of Gastroenterology; Kohnodai Hospital, National Center for Global Health and Medicine; Tokyo; Japan
12. Department of Gastroenterology and Hepatology; National Center for Global Health and Medicine; Tokyo; Japan
13. Department of Pathology; Niigata University; Niigata; Japan
14. Department of Internal Medicine; Asahi University Murakami Memorial Hospital; Gifu; Japan