1. Hospital of Ministry of Interior and Administration, 40-052 Katowice, Poland
2. Department of Histology, Cytophysiology and Embryology, Faculty of Medicine, Academy of Silesia, 41-800 Zabrze, Poland
3. ICZ Healthcare Hospital in Zywiec, 34-300 Zywiec, Poland
4. Department of Histology, Cytophysiology and Embryology, Faculty of Medicine in Zabrze, Academy of Silesia, 40-055 Katowice, Poland
5. Department of Histology, Cytophysiology and Embryology, Faculty of Medicine in Zabrze, Academy of Silesia, 40-555 Katowice, Poland
6. Department of Neurosurgery, 5th Military Clinical Hospital with the SP ZOZ Polyclinic in Krakow, 30-901 Krakow, Poland