1. Department of Pathology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
2. Department of Histology, Omar Al-Mukhtar University, Al-Bayda, Libya
3. Department of Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
4. Research Program Unit, Translational Cancer Biology, University of Helsinki, Helsinki, Finland
5. Department of Otorhinolaryngology—Head and Neck Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
6. Department of Oral Pathology and Radiology, University of Turku, Turku, Finland
7. Research Program in Systems Oncology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
8. Division of Ear, Nose and Throat Diseases, Department of Clinical Sciences, Intervention and Technology, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden