1. Department of Speech-Language Pathology and Audiology, University of Pretoria, c/o Lynnwood and University Roads, Hatfield, Pretoria 0002, South Africa.
2. Sonova AG, Science and Technology, Stäfa, Switzerland.
3. International Centre for Eye Health, London School of Hygiene & Tropical Medicine, London, England.
4. Ear Science Institute Australia, Subiaco, Australia.