[1] Imperial Coll London, London, England
[2] McGill Univ, Montreal, PQ, Canada
[3] London Sch Hyg & Trop Med, London, England
[4] Univ Calif Davis, Davis, CA 95616 USA
[5] Univ Pittsburgh, Sch Med, Pittsburgh, PA 15260 USA
[6] Univ Calif Los Angeles, AIDS Inst, Los Angeles, CA 90024 USA
[7] Univ Calif Los Angeles, Vatche & Tamar Manoukian Div Digest Dis, Los Angeles, CA 90024 USA
[8] FHI 360, Washington, DC USA
[9] RTI Int, Durham, NC USA
[10] US Mil HIV Res Program, Rockville, MD USA
[11] Henry M Jackson Fdn Adv Mil Med, Bethesda, MD USA
[12] NIH, Bldg 10, Bethesda, MD 20892 USA
[13] Univ Alabama Birmingham, Birmingham, AL USA
[14] Univ Zimbabwe, Harare, Zimbabwe
[15] Univ Washington, Seattle, WA 98195 USA