[1] Massachusetts Gen Hosp, Div Infect Dis, Boston, MA 02114 USA
[2] Massachusetts Gen Hosp, Div Gen Med, Boston, MA 02114 USA
[3] McCord Hosp, Durban, South Africa
[4] St Marys Hosp, Durban, South Africa
[5] Boston Univ, Sch Publ Hlth, Div Infect Dis, Boston, MA USA
[6] Boston Univ, Sch Publ Hlth, Brigham & Womens Hosp, Harvard Ctr AIDS Res CFAR, Boston, MA USA
[7] Boston Univ, Sch Publ Hlth, Dept Epidemiol, Boston, MA USA
[8] Boston Univ, Sch Publ Hlth, Dept Biostat, Boston, MA USA