1. Department of Clinical Science, Unit of OtorhinolaryngologyUmeå University Umeå Sweden
2. Department of Surgical Sciences, Section of Otorhinolaryngology and Head & Neck SurgeryUppsala University Uppsala Sweden
3. Region Västra Götaland, Regional Cancer Centre West, Gothenburg, Sweden, and Department of Oncology, Institute of Clinical Sciences, Sahlgrenska AcademyUniversity of Gothenburg Gothenburg Sweden
4. Department of Otorhinolaryngology‐Head and Neck Surgery, Institute of Clinical SciencesSahlgrenska Academy at University of Gothenburg, Sahlgrenska University Hospital Gothenburg Sweden
5. Department of ENT and Maxillofacial SurgeryNAL Medical Center Hospital Trollhättan Sweden
6. Department of Clinical Science/ENT/Sunderby Research UnitUmeå University Umeå Sweden