1. Division of ENT Diseases, Department of Clinical Sciences Intervention and Technology, Karolinska Institutet Stockholm Sweden
2. Department of Otorhinolaryngology Karolinska University Hospital Stockholm Sweden
3. Department of Pathology and Cytology Karolinska University Hospital Stockholm Sweden
4. Medical unit Head Neck, Lung and skin Cancer Karolinska University Hospital Stockholm Sweden
5. Department of Surgical Sciences, Section of Otolaryngology and Head and Neck Surgery Uppsala University Uppsala Sweden