1. Department of Pathology; University of Helsinki; Helsinki Finland
2. Department of Pathology; University of Turku; Turku Finland
3. Institute of Dentistry; University of Misurata; Misurata Libya
4. Department of Oral and Maxillofacial Diseases; University of Helsinki; Helsinki Finland
5. Master of Biostatistics; Department of Statistics; Faculty of Sciences; Hasselt University; Hasselt Belgium
6. Department of Otorhinolaryngology and Head and Neck Surgery; Helsinki University Hospital and University of Helsinki; Helsinki Finland
7. Cancer and Translational Medicine Research Unit; Medical Research Centre Oulu; University of Oulu and Oulu University Hospital; Oulu Finland
8. Department of Molecular Medicine and Surgery; Karolinska Institutet; Karolinska University Hospital; Stockholm Sweden
9. Department of Otorhinolaryngology and Head and Neck Surgery; Kuopio University Hospital; Kuopio Finland
10. HUSLAB; Department of Pathology; Helsinki University Hospital; Helsinki Finland
11. Research Programmes Unit; Translational Cancer Biology; University of Helsinki; Helsinki Finland
12. Department of Otorhinolaryngology and Head and Neck Surgery; Tampere University Hospital; Tampere Finland
13. Department of Pathology and Forensic Medicine; University of Eastern Finland; Kuopio Finland
14. Department of Head and Neck Surgery and Otorhinolaryngology; A. C. Camargo Cancer Centre; São Paulo-SP Brazil
15. Department of Otorhinolaryngology and Head and Neck Surgery; Turku University Hospital; University of Turku; Turku Finland
16. Department of Surgery; University of Helsinki and Helsinki University Hospital; Helsinki Finland
17. Division of Ear, Nose and Throat Diseases; Department of Clinical Sciences, Intervention and Technology; Karolinska Institutet; Karolinska University Hospital; Stockholm Sweden
18. Department of Oral Diagnosis; School of Dentistry; State University of Campinas; Piracicaba São Paulo Brazil