1. University of Belgrade, Faculty of Medicine, Belgrade, Serbia + Zemun Clinical Hospital Centre, Department of Cardiology, Belgrade, Serbia
2. University Clinical Centre of Serbia, Cardiology Clinic, Belgrade, Serbia + University of Defense, Medical Faculty, Belgrade, Serbia
3. University of Belgrade, Faculty of Medicine, Belgrade, Serbia + Military Medical Academy, Belgrade, Serbia
4. University of Belgrade, Faculty of Medicine, Belgrade, Serbia + Ars Medica Polyclinic, Belgrade, Serbia
5. Cardiointerna Cardiology Practice, Belgrade, Serbia
6. University of Belgrade, Faculty of Medicine, Belgrade, Serbia + Zvezdara Clinical Hospital Centre, Belgrade, Serbia
7. University of Novi Sad, Faculty of Medicine, Novi Sad, Serbia + Institute of Cardiovascular Diseases of Vojvodina, Sremska Kamenica, Serbia
8. University of Niš, Faculty of Medicine, Niš, Serbia + Niška Banja Institute for Treatment and Rehabilitation, Niška Banja, Serbia
9. University of Belgrade, Faculty of Medicine, Belgrade, Serbia