[1] Open Soc Fdn, Int Harm Reduct Dev Program, New York, NY 10019 USA
[2] INSERM, U912, SE4S, F-13258 Marseille, France
[3] Univ Aix Marseille, IRD, Marseille, France
[4] ORS PACA, Marseille, France
[5] Univ N Carolina, Dept Epidemiol, Gillings Sch Global Publ Hlth, Chapel Hill, NC USA
[6] Yale Univ, AIDS Programme, New Haven, CT USA
[7] St Vincents Hosp, Alcohol & Drug Serv, Darlinghurst, NSW 2010, Australia