[1] Nihon Pharmaceut Univ, 10281 Komuro, Inamachi, Saitama 3620806, Japan
[2] Sojo Univ, Fac Pharmaceut Sci, 4-22-1 Ikeda, Kumamoto 8600082, Japan
[3] Kumamoto Univ, Sch Med, Dept Infect Dis, Kumamoto 8608556, Japan
[4] Kumamoto Univ, Sch Med, Dept Hematol, Kumamoto 8608556, Japan
[5] Natl Ctr Global Hlth & Med, Clin Res Ctr, Shinjuku Ku, 1-21-1 Toyama, Tokyo 1628655, Japan
[6] Kagoshima Univ, Grad Sch Med & Dent Sci, Ctr Chron Viral Dis, Div Antiviral Chemotherapy, Kagoshima 8908544, Japan
[7] NCI, Expt Retrovirol Sect, HIV & AIDS Malignancy Branch, NIH, Bethesda, MD 20892 USA
[8] Showa Univ, Sch Pharm, Shinagawa Ku, 1-5-8 Hatanodai, Tokyo 1428555, Japan