1. Department of Clinical Pathomorphology; Collegium Medicum in Bydgoszcz; Nicolaus Copernicus University; Bydgoszcz Poland
2. Department of Otolaryngology and Clinical Oncology Chair and Clinic of Otolaryngology; Collegium Medicum in Bydgoszcz; Nicolaus Copernicus University; Bydgoszcz Poland
3. Department of Oncologic Pathology; Poznan University of Medical Sciences; Poznan, Poland