1. Discipline of Audiology, School of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa
2. African Cancer Institute, Faculty of Medicine and Health Sciences, Stellenbosch University, P.O. Box 241, Cape Town 8000, South Africa
3. Division of Community Health, Faculty of Medicine and Health Sciences, Stellenbosch University, P.O. Box 241, Cape Town 8000, South Africa