1. Department of Internal Medicine, Fujita Health University Nanakuri Memorial Hospital
2. Department of Gastroenterology and Hepatology, Gifu Municipal Hospital
3. Department of Gastroenterology, Gihoku Kosei Hospital
4. Department of Gastroenterology, Gifu Prefectural General Medical Center
5. Department of Gastroenterology, Matsunami General Hospital
6. Division of Virology, Department of Infection and Immunity, Jichi Medical University School of Medicine