1. Department of Medicine and Clinical Oncology, Graduate School of Medicine, Chiba University
2. Department of Emergency and Critical Care Medicine, Graduate School of Medicine, Chiba University
3. Yokohama City University School of Medicine
4. Division of Gastroenterology, Showa University Fujigaoka Hospital
5. Department of Gastroenterology and Hepatology, Iwate Medical University
6. Department of Digestive and Lifestyle Related Disease, Health Research Course, Human and Environmental Sciences, Kagoshima University Graduate School of Medical and Dental Sciences
7. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Faculty of Medicine, Saitama Medical University