1. Institute of Neuroscience and Physiology, Speech and Language Pathology Unit, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
2. Department of Research, Sunnaas Rehabilitation Hospital, Bjørnemyr, Norway
3. Skaraborgs Hospital, Skövde, Sweden
4. Department of Special Needs Education, University of Oslo, Oslo, Norway
5. Department of Otorhinolaryngology and Head and Neck Surgery, Leiden University Medical Centre, Leiden, The Netherlands
6. Faculty of Health Sciences, Curtin School of Allied Health, Curtin University, Perth, Western, Australia
7. Department of Psychology, University of Oslo, Oslo, Norway