1. Department of Otorhinolaryngology and Maxillofacial Surgery Zealand University Hospital Køge Denmark
2. Department of Otorhinolaryngology, Head and Neck Surgery and Audiology Rigshospitalet, University Hospital of Copenhagen Copenhagen Denmark
3. Institute of Clinical Medicine University of Copenhagen Copenhagen Denmark
4. Danish Cancer Society Research Center Copenhagen Denmark
5. Department of Clinical Oncology and Palliative Care Zealand University Hospital Næstved Denmark