1. Centre for Adolescent Health; Royal Children's Hospital, Murdoch Children's Research Institute, University of Melbourne; Melbourne; Victoria; Australia
2. National Drug and Alcohol Research Centre; University of New South Wales; Sydney; New South Wales; Australia
3. Clinical Epidemiology and Biostatistics Unit; Murdoch Children's Research Institute and University of Melbourne Department of Paediatrics; Melbourne; Victoria; Australia
4. University of Queensland Centre for Clinical Research; Brisbane; Queensland; Australia