1. Department of Psychiatry & Mental Health, University of Cape Town, Cape Town, South Africa
2. Medical Research Council (MRC) Unit on Anxiety & Stress Disorders, Cape Town, South Africa
3. Department of Paediatrics and Child Health, Red Cross War Memorial Children's Hospital, University of Cape Town and Medical Research Council (MRC) Unit on Child & Adolescent Health, Cape Town, South Africa
4. Division of Developmental Paediatrics, Department of Paediatrics & Child Health, Red Cross War Memorial Children's Hospital, University of Cape Town, Cape Town, South Africa