1. Department of Histology and Embryology, Faculty of Medicine, University of Niš, 18000 Niš, Serbia
2. Department of Biochemistry, Faculty of Medicine, University of Niš, 18000 Niš, Serbia
3. Clinic for Orthopedic Surgery and Traumatology, University Clinical Centre Niš, 18000 Niš, Serbia
4. Department of Pathology, Faculty of Medicine, Clinical Centre Niš, University of Niš, 18000 Niš, Serbia