1. Joint Research Center for Human Retrovirus Infection, Kumamoto University, Kumamoto, Japan
2. Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
3. Clinical Research Center, National Hospital Organization Nagoya Medical Center, Nagoya, Aichi, Japan
4. Department of Immunology, Faculty of Medicine, Academic Assembly, University of Toyama, Toyama, Japan
5. Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, Osaka, Japan