1. Patientforening Decibel, Hellerup, Denmark
2. Department of Otolaryngology, Head and Neck Surgery, Copenhagen University Hospital, Copenhagen, Denmark
3. Vestdansk CI-Center/Audiologisk Klinik, Aarhus Universitetshospital, Aarhus C, Denmark
4. Faculty of Medical Sciences, University of Groningen, Groningen, Holland