[1] Harvard Univ, Sch Publ Hlth, Dept Soc, Human Dev & Hlth,Landmark Ctr, Boston, MA 02115 USA
[2] IFR126, Inserm U558, Toulouse, France
[3] Hop Purpan, COREVIH, Unit Infect & Trop Dis, Toulouse, France
[4] Harvard Univ, Sch Publ Hlth, Dept Epidemiol, Cambridge, MA 02138 USA
[5] Harvard Univ, Sch Publ Hlth, Ctr Soc & Hlth, Cambridge, MA 02138 USA