1. Faculty of Medicine and Health, Medicine and Health, Örebro University, Örebro, Sweden
2. Department of Otorhinolaryngology, Central Hospital, Karlstad, Sweden
3. Neuro-, Head-, Neck Centre/Otorhinolaryngology, Umeå University Hospital, Umeå, Sweden
4. Department of Clinical Sciences, Division of Otorhinolaryngology, Umeå University, Umeå, Sweden
5. Department of Audiology, Örebro University Hospital, Örebro, Sweden
6. Audiological Research Centre, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
7. Department of Audiology, Region Västernorrland, Härnösand, Sweden
8. Department of otorhinolaryngology, County Hospital Sundsvall-Härnösand, Sundsvall, Sweden