1. Department of Internal Medicine, Fujita Health University Nanakuri Memorial Hospital
2. Department of Gastroenterology, Suzuka Chuo General Hospital
3. Department of Gastroenterology and Hepatology, Gifu Municipal Hospital
4. Department of Gastroenterology, Yokkaichi Municipal Hospital
5. Department of Gastroenterology and Hepatology, Gifu Prefectural General Medical Center
6. Department of Medical Sciences, Tokyo Shinagawa Hospital (former Toshiba General Hospital)
7. Department of Gastroenterology, Toshiba General Hospital
8. Division of Virology, Department of Infection and Immunity, Jichi Medical University School of Medicine