1. Department of Otorhinolaryngology University of Pretoria Pretoria South Africa
2. Departments of Biochemistry, Genetics and Microbiology, Faculty of Natural and Agricultural Sciences University of Pretoria Pretoria South Africa
3. Inqaba Biotechnology Pretoria South Africa
4. Department of Otolaryngology University of Miami Miller School of Medicine Miami Florida USA
5. Institute for Cellular and Molecular Medicine, Department of Immunology and SAMRC Extramural Unit for Stem Cell Research and Therapy, Faculty of Health Sciences University of Pretoria Pretoria South Africa