1. Department of Paediatrics and Child Health; Red Cross War Memorial Children's Hospital; Cape Town South Africa
2. MRC Unit on Child and Adolescent Health; University of Cape Town; Cape Town South Africa
3. Department of Psychiatry & Mental Health; Groote Schuur Hospital; University of Cape Town; Cape Town South Africa
4. South African Medical Research Council Unit on Risk and Resilience in Mental Disorders; Cape Town South Africa
5. Division of Epidemiology and Biostatistics; School of Public Health and Family Medicine; University of Cape Town; Cape Town South Africa