[1] Ctr Epidemiol & Populat Hlth Res, Burnet Inst, Melbourne, Vic, Australia
[2] Monash Univ, Dept Epidemiol & Prevent Med, Melbourne, Vic 3004, Australia
[3] Healthworks, Footscray, Vic, Australia
[4] Melbourne Sexual Hlth Ctr, Carlton, Vic, Australia
[5] Royal Childrens Hosp, Melbourne, Vic, Australia