[1] Osaka Univ, Inst Sci & Ind Res, Mihogaoka 8-1, Ibaraki, Osaka 5670047, Japan
[2] NIAID, Med Virol Sect, Lab Infect Dis, NIH, 50 South DR, Bethesda, MD 20814 USA
[3] MedStar Washington Hosp Ctr, 110 Irving St NW, Washington, DC 20010 USA
[4] Baylor Coll Med, Dept Pediat, 1102 Bates Ave, Houston, TX 77030 USA