1 Department of ORL Head and Neck Surgery and Audiology, Odense University Hospital, J. B. Winsløwsvej 4, 5000, Odense, Denmark. Camilla.mehlum@rsyd.dk.
2 Department of Otorhinolaryngology-Head and Neck Surgery, Aarhus University Hospital, Palle Juul-Jensens Boulevard 165, 8200, Aarhus N, Denmark.
3 Department of ORL Head and Neck Surgery and Audiology, Odense University Hospital, J. B. Winsløwsvej 4, 5000, Odense, Denmark.
4 Department of Head and Neck Surgery, Aalborg University Hospital, Hobrovej 18-22, 9000, Aalborg, Denmark.
5 Department of Otorhinolaryngology and Maxillofacial Surgery, Zealand University Hospital, Lykkebækvej 1, 4600, Køge, Denmark.
6 Department of Otorhinolaryngology, Head and Neck Surgery, and Audiology, Rigshospitalet, University Hospital of Copenhagen and University of Copenhagen, Blegdamsvej 9, 2100, Copenhagen, Denmark.
7 OPEN-Open Patient Data Explorative Network and Department of Clinical Research, Odense University Hospital and University of Southern Denmark, J. B. Winsløwsvej 9, 5000, Odense, Denmark.