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