1. Department of Otorhinolaryngology, Head and Neck Surgery, Kuopio University Hospital and University of Eastern Finland, Kuopio, Finland
2. Department of Otorhinolaryngology, Head and Neck Surgery, Oulu University Hospital, Oulu, Finland
3. PEDEGO Research Unit, University of Oulu, Oulu, Finland
4. Medical Research Center Oulu, Finland
5. Department of Otorhinolaryngology, Head and Neck Surgery, Faculty of Medicine and Life Sciences, University of Tampere and Tampere University Hospital, Tampere, Finland
6. Department of Otorhinolaryngology, Head and Neck Surgery, Turku University Hospital and University of Turku, Turku, Finland
7. Science Service Center, Kuopio University Hospital, Kuopio, Finland
8. Finnish Medical Association, Lääkäriliitto, Helsinki, Finland
9. Department of Otorhinolaryngology, Head and Neck Surgery, University of Helsinki and Helsinki University Hospital, Finland
10. Research Program in Systems Oncology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
11. Division of Ear, Nose and Throat Diseases, Department of Clinical Sciences, Intervention and Technology, Karolinska Institutet and Karolinska Hospital, Stockholm, Sweden