1. Department of Clinical Medicine, Aarhus University, Aarhus, Denmark;
2. Department of Oto-Rhino-Laryngology, Regional Hospital West Jutland, Holstebro, Denmark;
3. Department of ORL, Head and Neck Surgery and Audiology, Odense University Hospital, Odense C, Denmark;
4. Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark;
5. Department of Ear, Nose, Throat and Maxillofacial Surgery, Zealand University Hospital, Koege, Denmark;
6. Department of Otolaryngology, Head and Neck Surgery and Audiology, Aalborg University Hospital, Aalborg, Denmark;
7. The Danish Health Authority, Copenhagen, Denmark;
8. The Parker Institute, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Copenhagen, Denmark;
9. Ear, Nose and Throat Clinic, Faxe, Denmark