1. Department of Physiology, Poznan University of Medical Sciences, 60-567 Poznan, Poland
2. Department of Clinical Pathology, Poznan University of Medical Sciences, 60-567 Poznan, Poland
3. Department of Immunology, Poznan University of Medical Sciences, 60-567 Poznan, Poland
4. Department of Immunobiology, Poznan University of Medical Sciences, 60-567 Poznan, Poland
5. Department of Plastic Surgery, Faculty of Medicine, Academy of Silesia, 40-055 Katowice, Poland
6. Department of Histology, Cytophysiology and Embryology, Faculty of Medicine, Academy of Silesia, 40-055 Katowice, Poland
7. Department of Neurosurgery, Szpital sw. Rafala w Krakowie, 30-091 Krakow, Poland