[1] Univ Calif San Francisco, Div Infect Dis, San Francisco Gen Hosp, San Francisco, CA 94143 USA
[2] Univ Calif San Francisco, Dept Epidemiol & Biostat, San Francisco, CA 94143 USA
[3] Mbarara Univ Sci & Technol, Fac Med, Mbarara, Uganda
[4] Harvard Univ, Sch Med, Harvard Initiat Global Hlth, Massachusetts Gen Hosp, Boston, MA USA