1. Departments of Gastroenterology and Hepatology, and Medical Science Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Kita‐ku Okayama Japan
2. Department of Gastroenterology and Hepatology2 Shimane University Faculty of Medicine Izumo Shimane Japan
3. Department of Internal Medicine Izumo City General Medical Center Nadabun‐cho Izumo Shimane Japan
4. Department of Hepatology Japanese Red Cross Okayama Hospital Kita‐Ku Okayama Japan