1. Division of Otolaryngology; University of Cape Town; Cape Town South Africa
2. Christiaan Barnard Department of Cardiothoracic Surgery, University of Cape Town; Cape Town South Africa
3. Medical Imaging Research Unit; Division of Biomedical Engineering, Department of Human Biology; University of Cape Town; Cape Town South Africa
4. Faculty of Health Sciences; School of Public Health and Family Medicine, University of Cape Town; Cape Town South Africa