1. Department of Otorhinolaryngology, Malmö University Hospital, Sweden and Unit of Applied Clinical Research, NTNU, Trondheim
2. Unit of Applied Clinical Research, NTNU, Trondheim and Unit of Oncology and Palliative Care, Nordland Hospital, Bodø
3. Department of Otorhinolaryngology, Malmö University Hospital, Malmö,
4. Department of Public Health, Institute of Applied Health Sciences, University of Aberdeen, Aberdeen
5. Department of Radiotherapy and Oncology, University Hospital of Trondheim, Unit of Applied Clinical Research NTNU, Trondheim