1. Department of Speech-Language Pathology and Audiology, University of Pretoria, Pretoria, South Africa,
2. Ear Sciences Centre, School of Surgery, The University of Western Australia, Nedlands, Australia,
3. Ear Science Institute Australia, Subiaco, Australia,
4. Callier Center for Communication Disorders, University of Texas at Dallas, TX, USA, and
5. Department of Electrical, Electronic and Computer Engineering, University of Pretoria, Pretoria, South Africa