1. Department of Psychology University of Johannesburg Johannesburg South Africa
2. Alcohol, Tobacco and Other Drug Research Unit South African Medical Research Council Pretoria South Africa
3. School of Public Health and Family Medicine University of Cape Town Cape Town South Africa
4. School of Public Health University of the Witwatersrand Johannesburg South Africa
5. Institute for Therapy and Health Research Kiel Germany
6. Department of Sociology and Anthropology Nnamdi Azikiwe University Awka Nigeria
7. Centre for Research and Information on Substance Abuse Uyo Nigeria
8. Alcohol, Tobacco and Other Drug Research Unit South African Medical Research Council Cape Town South Africa
9. Department of Psychiatry University of Stellenbosch Cape Town South Africa