1. Department of Gastroenterology and Hepatology Hokkaido University Faculty of Medicine and Graduate School of Medicine Sapporo Japan
2. Clinical Research and Medical Innovation Center Hokkaido University Hospital Sapporo Japan
3. Division of Virology Department of Infection and Immunity Jichi Medical University Shimotsuke Japan
4. The Research Center for Hepatitis and Immunology National Center for Global Health and Medicine Ichikawa Japan