1. Department of Dental Surgery, Periodontology and Oral Mucosa Diseases, Poznan University of Medical Sciences, 70, Bukowska St., 60-812 Poznań, Poland
2. Department of Dermatology, Poznan University of Medical Sciences, 49, Przybyszewskiego St., 61-701 Poznań, Poland
3. The Maria Skłodowska-Curie Greater Poland Cancer Center, Department of Head and Neck Surgery, Poznan University of Medical Sciences, Garbary St., 61-701 Poznań, Poland