[1] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Epidemiol, Key Populat Program, Ctr Publ Hlth & Human Rights, 615 N Wolfe St 7133, Baltimore, MD 21205 USA
[2] Hlth Dev Initiat, Kigali, Rwanda
[3] Johns Hopkins Univ, Sch Med, Baltimore, MD 21218 USA
[4] Emory Univ, Sch Med, Atlanta, GA 30322 USA
[5] Projet San Francisco, Kigali, Rwanda
[6] Hop Univ Geneve, Dept Psychiat, Serv Addictol, Geneva, Switzerland
[7] Univ British Columbia, Sch Populat & Publ Hlth, Vancouver, BC V5Z 1M9, Canada
[8] BC Ctr Dis Control, Vancouver, BC V5Z 4R4, Canada
[9] Rwanda Biomed Ctr, Kigali, Rwanda