1. Department of Otorhinolaryngology - Head and Neck Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
2. Research Program in Systems Oncology, University of Helsinki, Helsinki, Finland
3. Finnish Cancer Registry, Institute for Statistical and Epidemiological Cancer Research, Helsinki, Finland
4. Sibelius Academy, University of the Arts, Helsinki, Finland
5. Cancer Registry of Norway, Oslo, Norway
6. Institute of Environmental Medicine – IMM, Karolinska Institutet, Stockholm, Sweden
7. National Institute of Occupational Health (STAMI), Oslo, Norway
8. Institute of Health and Society, University of Oslo, Oslo, Norway
9. Icelandic Cancer Registry, Reykjavik, Iceland
10. Centre of Public Health Sciences, University of Iceland, Reykjavik, Iceland
11. Division of Ear, Nose and Throat Diseases, Department of Clinical Sciences, Intervention and Technology, Karolinska Institutet and Karolinska Hospital, Stockholm, Sweden
12. Health Sciences Unit, Faculty of Social Sciences, Tampere University, Tampere, Finland