1. Department of Otorhinolaryngology – Head and Neck Surgery, HUS Helsinki University Hospital, University of Helsinki, Helsinki, Finland
2. Finnish Cancer Registry, Institute for Statistical and Epidemiological Cancer and Research, Helsinki, Finland
3. Research Program in Systems Oncology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
4. Department of Pathology, HUS Helsinki University Hospital, University of Helsinki, Helsinki, Finland
5. Department of Clinical Sciences, Intervention and Technology, Division of Ear, Nose and Throat Diseases, Karolinska Institutet and Karolinska Hospital, Stockholm, Sweden
6. Danish Cancer Society Research Center, Copenhagen, Denmark
7. Nykøbing Falster Hospital, University of Copenhagen, Nykøbing Falster, Denmark
8. Department of Research, Cancer Registry of Norway, Oslo, Norway
9. Institute of Environmental Medicine, IMM Karolinska Institutet, Stockholm, Sweden
10. National Institute of Occupational Health (STAMI), Oslo, Norway
11. Institute of Health and Society, University of Oslo, Oslo, Norway
12. Icelandic Cancer Registry, Reykjavik, Iceland
13. Centre of Public Health Sciences, Faculty of Medicine, University of Iceland, Reykjavik, Iceland
14. Cancer and Translational Medicine Unit, Medical Research Unit, Oulu University Hospital, University of Oulu, Oulu, Finland
15. Oral and Maxillofacial Diseases, Haartman Institute, University of Helsinki, Helsinki, Finland
16. Health Sciences Unit, Faculty of Social Sciences, Tampere University, Tampere, Finland