1. Office for Promotion of Hepatitis Measures, Cancer and Disease Control Division, Health Service Bureau, Ministry of Health, Labour and Welfare, Tokyo, Japan.
2. Department of Gastroenterology and Hepatology, National Hospital Organization Hokkaido Medical Center, Hokkaido, Japan.
3. Hepatitis Information Center, The Research Center for Hepatitis and Immunology, National Center for Global Health and Medicine, Chiba, Japan.