[1] University of Gothenburg,Department of Otorhinolaryngology
[2] Sahlgrenska University Hospital, Head and Neck Surgery
[3] Sahlgrenska University Hospital,Department of Oncology
[4] Norra Älvsborgs Hospital,Department of Otorhinolaryngology
[5] Central Hospital Skövde,Department of Otorhinolaryngology
[6] Sahlgrenska University Hospital,Department of Clinical Pathology and Genetics