1. Department of Head and Neck Surgery, Poznan University of Medical Sciences, The Greater Poland Cancer Center, Poznan, Poland
2. Department of Cancer Pathology and Prophylaxis, Poznan University of Medical Sciences, Greater Poland Cancer Center, Poznan, Poland
3. Department of Otolaryngology and Maxillofacial Surgery, University of Zielona Gora, Zielona Gora, Poland
4. Department of Dermatology, Poznań University of Medical Sciences, Poznan, Poland