1. Department of Internal Medicine & Gastrointestinal Endoscopy; Saga Medical School; Saga; Japan
2. Department of Gastroenterology; Osaka City University Graduate School of Medicine; Osaka; Japan
3. Department of Gastroenterology and Hepatology; Shimane University School of Medicine; Shimane; Japan
4. Gastroenterology Division; Yokohama City University Hospital; Kanagawa; Japan
5. Center for Clinical Research; Hamamatsu University School of Medicine; Shizuoka; Japan
6. Masuyama Gastrointestinal Clinic; Tochigi; Japan
7. Department of Gastroenterology; Dokkyo Medical University; Tochigi; Japan
8. Department of Gastroenterology; Juntendo University School of Medicine; Tokyo; Japan
9. Department of Gastroenterology; Kawasaki Medical School; Kanagawa; Japan
10. Second Department of Internal Medicine; Osaka Medical College; Osaka; Japan
11. Third Department of Internal Medicine; Kyorin University School of Medicine; Tokyo; Japan
12. Department of Endoscopy and Endoscopic Surgery; Gunma University Hospital; Gunma; Japan
13. Department of Medicine; Division of Gastroenterology; Nippon Medical School; Tokyo; Japan
14. Division of Endoscopy; Hokkaido University Hospital; Hokkaido; Japan
15. Department of Comprehensive Medicine and Psychosomatic Medicine; Tohoku University Hospital; Miyagi; Japan
16. Division of Upper Gastroenterology; Department of Internal Medicine; Hyogo College of Medicine; Nishinomiya; Japan
17. Department of Molecular Gastroenterology and Hepatology; Kyoto Prefectural University of Medicine; Kyoto; Japan
18. Department of Internal Medicine; Saga Medical School; Saga; Japan