[1] Univ Amsterdam, Acad Med Ctr, Ctr Infect & Immun Amsterdam CINIMA, Lab Expt Virol,Dept Med Microbiol, Amsterdam, Netherlands
[2] Univ Lubeck, Univ Klinikum Schleswig Holstein, Inst Mol Med, Lubeck, Germany
[3] Univ Wisconsin, Dept Biochem, Madison, WI USA