1. School of Public Health, University of the Western Cape, Bellville, South Africa
2. School of Pharmacy, University of the Western Cape, Belville, South Africa
3. Division of Social and Behavioural Sciences, School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa
4. Mental Health, Alcohol, Substance Use and Tobacco Research Unit, South African Medical Research Council, Cape Town, South Africa
5. Department of Mental Health and Psychiatry, University of Cape Town, Cape Town, South Africa
6. School of Public Health, University of Cape Town, Cape Town, South Africa
7. Institute for Life Course Health Research, Department of Global Health, Stellenbosch University, Stellenbosch, South Africa
8. School of Nursing and Midwifery, Queens University, Belfast, UK
9. Health Systems Research Unit, South African Medical Research Council, Cape Town, South Africa