1. Neuroscience Institute, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
2. Division of Neurosurgery, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
3. Department of Surgical Sciences, Division of Orthopaedic Surgery, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
4. Department of Paediatrics and Child Health, Division of Developmental Paediatrics, Red Cross War Memorial Children’s Hospital, University of Cape Town, Cape Town, South Africa