1. Department of Internal medicine and patient care, Faculty of Medicine, University of Nis, Niš, Serbia
2. Clinic of hematology, allergology and clinical immunology, University Clinical Center in Nis, Niš, Serbia
3. Department of Pathophysiology, Faculty of Medicine, University of Nis, Niš, Serbia
4. Clinic of Cardiology, University Clinical Center of Nis, Niš, Serbia
5. Department of Biochemistry, Faculty of Medicine, University of Nis, Niš, Serbia
6. Medical Biochemistry Center, University Clinical Center of Nis, Niš, Serbia