1. Department of Clinical Sciences Intervention and Technology, Division of Ear Nose and Throat Diseases, Karolinska Institutet, Stockholm, Sweden
2. Department of Head and Neck Surgery, Medical Unit Head Neck Lung and Skin Cancer, Karolinska University Hospital, Stockholm, Sweden
3. Medical Unit Otorhinolaryngology, Karolinska University Hospital, Stockholm, Sweden
4. Department of Otolaryngology, Faculty of Medicine and Health, Örebro University Hospital, Örebro, Sweden
5. Department of Clinical Pathology and Cytology, Karolinska University Hospital, Stockholm, Sweden