1. Finnish Cancer Registry, Institute for Statistical and Epidemiological Cancer Research, Helsinki, Finland
2. Faculty of Social Sciences, Tampere University, Tampere, Finland
3. Department of Otorhinolaryngology – Head and Neck Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
4. Musician Clinic, Helsinki Music Hall, Helsinki, Finland
5. Sibelius Academy, University of the Arts, Helsinki, Finland
6. Department of Clinical Sciences, Intervention and Technology, Division of Ear, Nose and Throat Diseases, Karolinska Institutet and Karolinska Hospital, Stockholm, Sweden
7. Research Program in Systems Oncology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
8. Department of Research, Cancer Registry of Norway, Oslo, Norway
9. Karolinska Institutet, Stockholm, Sweden
10. Icelandic Cancer Registry, Reykjavik, Iceland
11. Faculty of Medicine, University of Iceland, Reykjavik, Iceland
12. International Agency for Research on Cancer/World Health Organization (IARC/WHO), Lyon, France