1. Division of General Medicine Asahikawa Medical University Hospital Asahikawa Hokkaido Japan
2. Department of Gastroenterological Sciences Asahikawa Medical University Asahikawa Hokkaido Japan
3. Furano Hospital Furano Hokkaido Japan
4. Division of Gastroenterology, Department of Internal Medicine Asahikawa Medical University Asahikawa Hokkaido Japan
5. Nakashibetsu Town Hospital Nakashibetsu Hokkaido Japan
6. Asahikawa Kosei General Hospital Asahikawa Hokkaido Japan
7. Nayoro City General Hospital Nayoro Hokkaido Japan
8. Engaru Kosei General Hospital Engaru Hokkaido Japan
9. Asahikawa City Hospital Asahikawa Hokkaido Japan