[1] UNSW Australia, Natl Drug & Alcohol Res Ctr, Sydney, NSW, Australia
[2] Univ Tasmania, Sch Med, Hobart, Tas, Australia
[3] Univ Sydney, Sydney Med Sch, Sydney, NSW, Australia
[4] South Eastern Sydney Local Hlth Dist Drug & Alcoh, Langton Ctr, Sydney, NSW, Australia
[5] UNSWAustralia, St Vincents Clin Sch, UNSW Med, Sydney, NSW, Australia
[6] Univ Queensland, Ctr Youth Subst Abuse Res, Brisbane, Qld, Australia
[7] Kings Coll London, Natl Addict Ctr, London, England
[8] Univ Melbourne, Sch Populat & Global Hlth, Melbourne, Vic, Australia
[9] Murdoch Childrens Res Inst, Melbourne, Vic, Australia
[10] Univ Washington, Sch Publ Hlth, Dept Global Hlth, Seattle, WA 98195 USA