1. Department of Speech-Language Pathology and Audiology, University of Pretoria, Pretoria, South Africa
2. Department of Science, Mathematics and Technology Education, University of Pretoria, Pretoria, South Africa
3. Department of Audiology, University of the Witwatersrand, Johannesburg, South Africa
4. Ndlovu Wits Audiology Clinic, Dennilton, South Africa
5. Division of Communication Science and Disorders, Department of Health and Rehabilitation Sciences, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
6. Ear Science Institute Australia, Subiaco, Australia
7. Department of Otolaryngology-Head and Neck Surgery, University of Colorado School of Medicine, Aurora, Colorado, USA