[1] Harvard Med Sch, Massachusetts Gen Hosp, Boston, MA USA
[2] Univ Cape Town, Desmond Tutu HIV Fdn, Rondebosch, South Africa
[3] Makerere Joint AIDS Program, Kampala, Uganda
[4] Mbarara Univ Sci & Technol, Mbarara, Uganda
[5] Kabwohe Clin Res Ctr, Kabwohe, Uganda
[6] Univ Calif San Francisco, San Francisco, CA 94143 USA