1. Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Stellenbosch, South Africa
2. Department of Obstetrics and Gynaecology, Faculty of Medicine and Health Sciences, Stellenbosch University, Stellenbosch, South Africa
3. Division of Radiodiagnosis, Faculty of Medicine and Health Sciences, Stellenbosch University, Stellenbosch, South Africa
4. Department of Radiology, the Children's Hospital of Philadelphia and Perelman School of Medicine of the University of Pennsylvania, Philadelphia, Pennsylvania
5. Department of Obstetrics and Gynaecology, University of Cape Town, Cape Town, South Africa