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