1. Institute of Human Genetics; Polish Academy of Sciences; Poznan Poland
2. Department of Clinical Pathomorphology; Collegium Medicum in Bydgoszcz; Nicolaus Copernicus University in Torun; Bydgoszcz Poland
3. Department of Otolaryngology and Laryngological Oncology; Poznan University of Medical Sciences; Poznan Poland
4. Department of Tumor Pathology; Greater Poland Cancer Center; Poznan Poland
5. Department of Hematology and Bone Marrow Transplantation; Poznan University of Medical Sciences; Poznan Poland
6. Department of Otorhinolaryngology, -Head and Neck Surgery; Turku University Central Hospital and Turku University; Turku Finland
7. Department of Medical Biochemistry; Turku University Central Hospital and Turku University; Turku Finland
8. Department of Tumor Pathology and Prophylaxis; Poznan University of Medical Sciences and Greater Poland Cancer Center; Poznan Poland