[1] St Jude Childrens Res Hosp, Dept Virol & Mol Biol, 332 N Lauderdale St, Memphis, TN 38105 USA
[2] Univ Hong Kong, Queen Mary Hosp, Dept Microbiol, Hong Kong, Peoples R China
[3] Jiangxi Med Coll, Dept Microbiol, Nanchang, Peoples R China
[4] Leiden Univ, Med Ctr, Dept Virol, Leiden, Netherlands