1. Department of Liver Disease, Research Center for Hepatitis and Immunology, National Center for Global Health and Medicine, Ichikawa, Japan
2. Genome Medical Sciences Project, National Center for Global Health and Medicine, Ichikawa, Japan
3. Department of Virology II, National Institute of Infectious Diseases, Tokyo, Japan
4. Division of Gastroenterology, Department of Medicine, Kurume University School of Medicine, Kurume, Japan
5. Department of Epidemiology, Infectious Disease Control and Prevention, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
6. AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan