[1] Stanford Univ, Sch Med, Dept Mol & Cellular Physiol, Howard Hughes Med Inst, Stanford, CA 94305 USA
[2] Stanford Univ, Sch Med, Dept Biol Struct, Stanford, CA 94305 USA
[3] Rockefeller Univ, Lab Virol & Infect Dis, New York, NY 10065 USA
[4] Stanford Univ, Sch Med, Dept Microbiol & Immunol, Dept Med,Div Gastroenterol & Hepatol, Stanford, CA 94305 USA
[5] Stanford Univ, Sch Med, Stanford, CA 94305 USA
[6] Weill Cornell Med, Div Gastroenterol & Hepatol, Ctr Study Hepatitis C, New York, NY 10065 USA