1. Department of Cardiology, Emergency Center, University Clinical Center of Serbia, 11000 Belgrade, Serbia
2. Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
3. Faculty of Organizational Sciences, University of Belgrade, 11000 Belgrade, Serbia
4. Clinical Center Bezanijska Kosa, 11000 Belgrade, Serbia
5. Department of Cardiology, University Clinical Center of Serbia, 11000 Belgrade, Serbia