1. Digestive and Lifestyle Diseases, Human and Environmental Sciences, Health Research; Kagoshima University Graduate School of Medical and Dental Sciences; Kagoshima; Japan
2. Department of Gastroenterology and Hepatology; Saitama Medical University; Moroyama; Japan
3. Department of Gastroenterology and Hepatology,; School of Medicine; Iwate Medical University; Morioka; Japan
4. Department of Gastroenterology; Gifu University Graduate School of Medicine; Gifu; Japan
5. Department of Internal Medicine; School of Medicine; Keio University; Tokyo; Japan
6. Department of Gastroenterology and Hepatology; Shizuoka Hospital; Juntendo University; Izunokuni; Japan
7. Department of Gastroenterology and Hepatology; Kochi Medical School; Nankoku; Japan