1. Department of Gastroenterology and Hepatology Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Okayama Japan
2. Department of Gastroenterology Okayama City Hospital Okayama Japan
3. Medical Center for Clinical and Translational Research Hiroshima University Hospital Hiroshima Japan
4. Department of Internal Medicine Hiroshima City Hiroshima Citizens Hospital Hiroshima Japan
5. Department of Internal Medicine Fukuyama City Hospital Hiroshima Japan
6. Department of Internal Medicine Japanese Red Cross Okayama Hospital Okayama Japan
7. Department of Gastroenterology Mitoyo General Hospital Kannonji Japan