1. Department of Nursing Gifu Kyoritsu University Japan
2. Department of Gastroenterology and Hepatology Ogaki Municipal Hospital Japan
3. Department of Gastroenterology and Hepatology Nagoya University Graduate School of Medicine Nagoya Japan
4. Center of Gastroenterology Teine Keijinkai Hospital Sapporo Japan
5. Department of Gastroenterology Okayama Saiseikai General Hospital Okayama Japan
6. Gastroenterology Center Ehime Prefectural Central Hospital Matsuyama Japan
7. Department of Gastroenterology Okayama City Hospital Okayama Japan
8. Department of Gastroenterology Saiseikai Niigata Hospital Niigata Japan
9. Department of Gastroenterology Kagoshima City Hospital Kagoshima Japan
10. Department of Internal Medicine Japanese Red Cross Himeji Hospital Himeji Japan
11. Department of Epidemiology Infectious Disease Control, and Prevention, Hiroshima University Institute of Biomedical and Health Sciences Hiroshima Japan