1. Department of Otorhinolaryngology, Head and Neck Surgery, Ålesund Hospital, Ålesund, Norway;
2. Department of Neuromedicine and Movement Science, Norwegian University of Science and Technology, Trondheim, Norway;
3. Department of Otorhinolaryngology, Head and Neck Surgery, Haukeland University Hospital, Bergen, Norway;
4. Department of Public Health and General Practice, Norwegian University of Science and Technology, Trondheim, Norway;
5. Department of Clinical Engineering, Haukeland University Hospital, Bergen, Norway;
6. School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Australia;
7. Department of Otorhinolaryngology, Head and Neck Surgery, St. Olavs University Hospital, Trondheim, Norway