1. Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences Stellenbosch University and Tygerberg Hospital Cape Town South Africa
2. Department of Otorhinolaryngology, Tygerberg Hospital, Faculty of Health Sciences University of Stellenbosch Cape Town South Africa
3. Department of Pediatric Radiology The Children's Hospital of Philadelphia Philadelphia Pennsylvania USA
4. Department of Radiology, Perelman School, of Medicine University of Pennsylvania Philadelphia Pennsylvania USA
5. Department of Surgical Sciences, Division of Cardiothoracic Surgery Stellenbosch University and Tygerberg Hospital Tygerberg South Africa