1. Department of Otorhinolaryngology, Faculty of Health Sciences, University of the Free State, Bloemfontein, South Africa.
2. Department of Otorhinolaryngology, Universitas Academic Hospital, Bloemfontein, South Africa
3. Department of Medical Microbiology & Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein, South Africa
4. Department of Medical Microbiology & Virology, National Health Laboratory Service Universitas, Bloemfontein, South Africa