[1] Gladstone Inst Virol & Immunol, J David Gladstone Inst, San Francisco, CA USA
[2] Univ Calif San Francisco, Dept Urol, San Francisco, CA USA
[3] Univ Ulm, Inst Mol Virol, Med Ctr, Ulm, Germany
[4] Univ Calif San Francisco, Dept Med, San Francisco, CA USA
[5] Univ Calif San Francisco, Dept Microbiol, San Francisco, CA 94143 USA
[6] Univ Calif San Francisco, Dept Immunol, San Francisco, CA 94143 USA