1. Department of Physiology, Faculty of Medicine, University of Nis, 18000 Nis, Serbia
2. Department of Pathology, Faculty of Medicine, University of Nis, 18000 Nis, Serbia
3. Department of Biochemistry, Faculty of Medicine, University of Nis, 18000 Nis, Serbia
4. Department of Pharmacology, Faculty of Medicine, University of Nis, 18000 Nis, Serbia