1. Department of Social Work, Education and Community Wellbeing, Northumbria University, Newcastle upon Tyne NE7 7XA, UK
2. Curtin School of Allied Health, Faculty of Health Sciences, Curtin University, Perth 6102, Australia
3. Department of Health & Rehabilitation Sciences, Faculty of Health Sciences, University of Cape Town, Cape Town 7935, South Africa
4. Department Special Needs Education, University of Oslo, 0318 Oslo, Norway
5. Department of Otorhinolaryngology and Head and Neck Surgery, Leiden University Medical Centre, 1233 Leiden, The Netherlands
6. Department of Otolaryngology Head-Neck Surgery, Boston University School of Medicine, Boston, MA 02118, USA
7. Department of Linguistics, Macquarie University, Sydney 2109, Australia
8. St John of God Midland Public and Private Hospitals, St John of God Health Care, Perth 6056, Australia
9. Department of Allied Health, The School of Medical and Health Sciences, Edith Cowan University, Perth 6027, Australia
10. Audiologic Phoniatric Service, Otorhinolaryngology Department, Infermi Hospital, AUSL Romagna, 47900 Rimini, Italy