1. Department of medical science, Faculty of Sport and Physical Education, University of Nis, Nis, Serbia
2. Department of Molecular Medicine, Universita Cattolica del Sacro Cuore, Rome, Italy
3. Medical faculty, University of Nis, Nis, Serbia
4. Clinic of Cardiology, Clinical Center Nis, Nis, Serbia
5. Faculty of Sport and Physical Education, University of Nis, Nis, Serbia
6. Niska Banja, Medical Faculty University of Nis, Institute of cardiology, Nis, Serbia
7. Clinic of Pediatrics, Clinical Center, Nis, Serbia