1. Department of Speech-Language Pathology and Audiology, University of Pretoria, Gauteng, South Africa
2. Ear Sciences Centre, School of Surgery, The University of Western Australia, Nedlands
3. Ear Science Institute Australia, Subiaco
4. Communication Sciences Research Center, Cincinnati Childrens' Hospital Medical Center, Cincinnati, OH
5. Manchester Centre for Audiology and Deafness, School of Health Sciences, University of Manchester, United Kingdom
6. Department of Otolaryngology/Head & Neck Surgery, Section Ear & Hearing, and Amsterdam Public Health Research Institute, VU University Medical Center, the Netherlands