1. Tissue Engineering Department; Nicolaus Copernicus University; Bydgoszcz; Poland
2. Department of Histology and Embryology; Nicolaus Copernicus University; Bydgoszcz; Poland
3. Department of Clinical Pathomorphology; Nicolaus Copernicus University; Bydgoszcz; Poland
4. Department of Experimental Oncology; Nicolaus Copernicus University; Bydgoszcz; Poland