1. Division of Gastroenterology, Department of Internal Medicine, Nippon Medical School Chiba Hokusoh Hospital, Japan
2. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Nippon Medical School, Japan
3. Core Research Facilities, The Jikei University School of Medicine, Japan
4. Department of Internal Medicine, Division of Gastroenterology and Hepatology, Otakanomori Hospital, Japan
5. Department of Gastroenterology, Ogaki Municipal Hospital, Japan
6. Department of Hepatology, Kagawa Prefectural Central Hospital, Japan
7. Gastroenterology Center, Ehime Prefectural Central Hospital, Japan