1. Division of Gastroenterology and Nephrology, Faculty of Medicine, Tottori University, Yonago, Japan
2. Department of Internal Medicine II, Shimane University Faculty of Medicine, Izumo, Japan
3. Division of Gastroenterology, Matsue Red Cross Hospital, Matsue, Japan
4. Gastrointestinal Endoscopy, Shimane University Hospital, Izumo, Japan
5. Division of Gastroenterology, Tottori Red Cross Hospital, Tottori, Japan
6. Division of Gastroenterology, Shimane Prefectural Central Hospital, Izumo, Japan
7. Division of Gastroenterology, Tottori Prefectural Central Hospital, Tottori, Japan
8. Division of Gastroenterology, Yonago Medical Center, Yonago, Japan
9. Division of Gastroenterology, Hamada Medical Center, Hamada, Japan
10. Division of Gastroenterology, Hakuai Hospital, Yonago, Japan
11. Division of Gastroenterology, Sanin Rosai Hospital, Yonago, Japan
12. Division of Gastroenterology, Sakaiminato Saiseikai General Hospital, Sakaiminato, Japan
13. Division of Internal Medicine, Izumo-City General Medical Center, Izumo, Japan
14. Endoscopic Center, Izumo Tokushukai Hospital, Izumo, Japan
15. Division of Gastroenterology, Tottori Prefectural Kosei Hospital, Kurayoshi, Japan
16. Division of Gastroenterology, Matsue City Hospital, Matsue, Japan
17. Steel Hirohata Memorial Hospital, Himeji, Japan.