1. Institute of Anatomy, Faculty of Medicine, Comenius University, Bratislava, Slovakia;
2. Department of Neurosurgery, Faculty of Medicine, University Hospital, Comenius University, Bratislava, Slovakia;
3. Institute of Pathological Anatomy, Health Care Surveillance Authority, Bratislava, Slovakia;
4. Institute of Histology and Embryology, Faculty of Medicine, Comenius University, Bratislava, Slovakia