1. Department of Infectious, Respiratory, and Digestive Medicine, Control and Prevention of Infectious Diseases, Faculty of Medicine, University of the Ryukyus, Japan
2. School of Dentistry, Matsumoto Dental University, Japan
3. AIDS Clinical Center, National Center for Global Health and Medicine Hospital, Japan
4. Division of Pathology, Kyorin University School of Medicine, Japan
5. Division of Pathology and Laboratory Medicine, Edogawa Hospital, Japan