1. Department of Otorhinolaryngology and Maxillofacial Surgery; Zealand University Hospital; Koge Denmark
2. Department of Otorhinolaryngology, Head and Neck Surgery and Audiology; Copenhagen University Hospital Rigshospitalet; Copenhagen Denmark
3. Department of Pathology; Copenhagen University Hospital; Copenhagen Denmark
4. Department of Pathology; University of Texas Southwestern Medical Center; Dallas Texas
5. Department of Pathology; Herlev Hospital, University of Copenhagen; Herlev Denmark