1. Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), 2-3-10 Kandasurugadai, Chiyoda-ku, Tokyo 101-0062, Japan
2. Department of Clinical Retrovirology, Joint Research Center for Human Retrovirus Infection, Kumamoto and Kagoshima Universities, Kumamoto 860-0811, Japan
3. Department of Hematology, Rheumatology, and Infectious Diseases, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan