1. School of Psychology; Deakin University; Geelong Australia
2. Department of Social and Epidemiological Research; Centre for Addiction and Mental Health; Toronto Canada
3. Dalla Lana School of Public Health; University of Toronto; Toronto Canada
4. Department of Psychology; Western University; London Canada
5. Department of Epidemiology and Biostatistics; Western University; London Canada
6. National Drug Research Institute; Curtin University of Technology; Perth Australia
7. National Addiction Centre, Maudsley Hospital/Institute of Psychiatry; King's College London; London UK