1. Department of Histology, Cytophysiology and Embryology, Academy of Silesia, Katowice, Poland
2. Department of Molecular Biology, Gyncentrum Fertility Clinic, Sosnowiec, Poland
3. Medical Center Dormed Medical SP, Busko-Zdrój, Poland
4. Department of Pharmacology, Academy of Silesia, Katowice, Poland
5. Faculty of Economics and Pedagogy, Higher School of Management and Administration in Opole, Opole, Poland