[1] London Sch Hyg & Trop Med, Dept Clin Res, London, England
[2] Melbourne Sexual Hlth Ctr, Carlton, Vic, Australia
[3] Monash Univ, Cent Clin Sch, Melbourne, Vic, Australia
[4] Nanjing Med Univ, Sch Publ Hlth, Dept Social Med & Hlth Educ, Nanjing, Peoples R China
[5] London Sch Hyg & Trop Med, Dept Populat Hlth, London, England
[6] Brown Univ, Sch Publ Hlth, Dept Behav & Social Sci, Providence, RI USA
[7] London Sch Hyg & Trop Med, Fac Publ Hlth & Policy, Dept Global Hlth & Dev, London, England
[8] Univ Warwick, Warwick Med Sch, Coventry, England
[9] Univ Texas San Antonio, San Antonio, TX USA
[10] Univ North Carolina Chapel Hill, Inst Global Hlth & Infect Dis, Chapel Hill, NC USA