1. Alcohol, Tobacco and Other Drug Research Unit South African Medical Research Council Cape Town South Africa
2. Department of Psychiatry University of Stellenbosch Cape Town South Africa
3. Curtin enAble Institute, Faculty of Health Sciences Curtin University Perth Western Australia Australia
4. Division of Addiction Psychiatry, Department of Psychiatry and Mental Health University of Cape Town Cape Town 7700 South Africa
5. Alcohol, Tobacco and Other Drug Research Unit South African Medical Research Council Pretoria South Africa
6. Institute for Mental Health Policy Research and Campbell Family Mental Health Research Institute Centre for Addiction and Mental Health Toronto Ontario Canada
7. Dalla Lana School of Public Health University of Toronto Toronto Ontario Canada
8. Department of Medicine University of California San Francisco San Francisco California USA
9. Department of Psychology University of Johannesburg Johannesburg South Africa
10. School of Public Health University of the Witwatersrand Johannesburg South Africa
11. School of Family Medicine and Public Health University of Cape Town Johannesburg South Africa