1. Alcohol, Tobacco and Other Drug Research Unit, South African Medical Research Council, Cape Town 7505, South Africa
2. Institute for Life Course Health Research, Department of Global Health, Stellenbosch University, Stellenbosch 7602, South Africa
3. Department of Psychiatry and Mental Health, University of Cape Town, Cape Town 7700, South Africa
4. SAMRC Unit on Risk and Resilience in Mental Disorders, Stellenbosch University, Stellenbosch 7602, South Africa