1. Department of Otorhinolaryngology and Maxillofacial Surgery; Køge University Hospital; Køge Denmark
2. Department of Otolaryngology Head and Neck Surgery and Audiology; Rigshospitalet; Copenhagen Denmark
3. University of Copenhagen; Copenhagen Denmark
4. Department of Pathology; Rigshospitalet; Copenhagen Denmark
5. Department of ORL-Head and Neck Surgery; Odense University Hospital; Odense Denmark