1. Hepatitis Information Center The Research Center for Hepatitis and Immunology National Center for Global Health and Medicine Ichikawa Chiba Japan
2. Hepatitis Prevention and Control Office Cancer and Disease Control Division Public Health Bureau Labor, and Welfare Tokyo Japan
3. Department of Hepato‐Biliary‐Pancreatic Surgery Osaka Metropolitan University Graduate School of Medicine Osaka Japan
4. Departments of Gastroenterology and Metabology Ehime University Graduate School of Medicine Toon Japan
5. Liver Center Saga University Hospital Faculty of Medicine Saga University Saga Japan
6. Department of Gastroenterology Graduate School of Medicine The University of Tokyo Tokyo Japan
7. Kanto Central Hospital Tokyo Japan