1. Department of Oto-rhino-Laryngology, Head and Neck Surgery and Audiology, Copenhagen University Hospital, Copenhagen, Denmark;
2. Danish Cancer Society Research Center, Danish Cancer Society, Copenhagen, Denmark;
3. Department of Oncology, Odense University Hospital, Odense, Denmark;
4. Department of Pathology, Copenhagen University Hospital, Copenhagen, Denmark;
5. Department of Oto-rhino-Laryngology, Odense University Hospital, Odense, Denmark;
6. Department of Oto-rhino-Laryngology, Aarhus University Hospital, Aarhus, Denmark;
7. Department of Oto-rhino-Laryngology, Aalborg University Hospital, Aalborg, Denmark