1 Department of ORL-Head and Neck Surgery, Odense University Hospital, Odense, Denmark.
2 Department of Pathology, Copenhagen University Hospital, Copenhagen, Denmark.
3 Department of ORL-Head and Neck Surgery, Aarhus University Hospital, Aarhus, Denmark.
4 Odense Patient Data Explorative Network, Odense University Hospital and Department of Clinical Research, University of Southern Denmark, Odense, Denmark.