[1] Johns Hopkins Bloomberg Sch Publ Hlth, Ctr Publ Hlth & Human Rights, Key Populat Program, Dept Epidemiol, 615 N Wolfe St,Room E6133, Baltimore, MD 21205 USA
[2] Univ Calif Los Angeles, Dept Community Hlth Sci, Fielding Sch Publ Hlth, Los Angeles, CA USA
[3] Minist Hlth, Div Lutte Sida & IST, Dakar, Senegal
[4] Natl Reference Ctr HIV & STDs, Mol Biol Unit, Dakar, Senegal
[5] Inst Rech Sante Surveillance Epidemiol & Format, Dakar, Senegal
[6] Enda Sante, Dakar, Senegal
[7] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Mental Hlth, Baltimore, MD USA