[1] Johns Hopkins Univ, Bloomberg Sch Publ Hlth, Dept Epidemiol, Baltimore, MD USA
[2] Johns Hopkins Univ, Ctr TB Res, Sch Med, Baltimore, MD USA
[3] Univ Witwatersrand, Perinatal HIV Res Unit, Soweto, South Africa
[4] Johns Hopkins Univ, Bloomberg Sch Publ Hlth, Dept Int Hlth, Baltimore, MD USA
[5] Klerksdorp Tshepong Hosp Complex, Dept Internal Med, Klerksdorp, South Africa