1. Department of Gastroenterology, Showa University Fujigaoka Hospital
2. Department of Emergency and Critical Care Medicine, Chiba University Graduate School of Medicine
3. Department of Gastroenterology and Hepatology, School of Medicine, Iwate Medical University
4. Department of Gastroenterology and Hepatology, Saitama Medical University
5. Department of Gastroenterology, Graduate School of Medicine, Chiba University
6. Division of Gastroenterology & Hepatology, Graduate School of Medical and Dental Sciences, Niigata University
7. Department of Digestive and Life-Style Related Disease, Health Research Course, Human and Environmental Sciences, Kagoshima University Graduate School of Medical and Dental Sciences
8. Department of Gastroenterology, Yamaguchi University Graduate School of Medicine
9. Department of Gastroenterology, Juntendo University Shizuoka Hospital
10. Department of Gastroenterology, Gifu University Graduate School of Medicine
11. Department of Medicine, Teikyo University School of Medicine