1. Department of Pharmaceutical Sciences, Faculty of Pharmaceutical Sciences, Sojo University, Kumamoto, Japan;
2. Department of Refractory Viral Infections, National Center for Global Health and Medicine Research Institute, Tokyo, Japan;
3. Department of Pharmaceutical Sciences, Nihon Pharmaceutical University, Saitama, Japan;
4. Experimental Retrovirology Section, HIV & AIDS Malignancy Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA;
5. Departments of Infectious Diseases and Hematology, Kumamoto University School of Medicine, Kumamoto, Japan