1. Division of ENT Diseases, Department of Clinical Science, Intervention and Technology (CLINTEC), Karolinska Institutet, Stockholm, Sweden and Department of ENT Diseases, Karolinska University Hospital, Stockholm, Sweden
2. Ear, Nose and Throat Clinic, Region Jönköping County, Jönköping, Sweden and Centre for Oral Health, Department of Odontology and Oral Health, School of Health and Welfare, Jönköping University, Jönköping, Sweden
3. The Public Health Agency of Sweden, Stockholm, Sweden