1. Premier Developmental Research of Medicine; Osaka Medical College; Osaka Japan
2. Second Department of Internal Medicine; Osaka Medical College; Osaka Japan
3. Department of Internal Medicine; Saga Medical School; Saga Japan
4. Department of General Medicine; Kawasaki Medical School; Kurashiki-city, Okayama Japan
5. Odaka Medical and Gastrointestinal Clinic; Chiba Japan
6. Hattori Clinic; Kumamoto Japan
7. Department of Endoscopy and Endoscopic Surgery; Gunma University Hospital; Maebashi Gunma Japan
8. Department of Gastroenterology; Juntendo University Shizuoka Hospital; Shizuoka Japan
9. Division of Gastroenterology; Department of Internal Medicine; Hyogo College of Medicine; Hyogo Japan
10. National Hospital Organization Hakodate Hospital; Hakodate Japan
11. Center for Clinical Research; Hamamatsu University School of Medicine; Hamamatsu Japan
12. Department of Gastroenterology; Oita University Faculty of Medicine; Oita Japan
13. Division of Gastroenterology; Department of Internal Medicine; Iwate Medical University; Iwate Japan
14. Department of Gastroenterology and Hepatology; Shimane University School of Medicine; Izumo Japan
15. University Hospitals Leuven; Leuven Belgium
16. Department of Gastroenterology; Osaka City University Graduate School of Medicine; Osaka Japan