1. University of Priština/Kosovska Mitrovica, Faculty of Medicine, Kosovska Mitrovica, Serbia
2. Military Medical Academy, Clinic for Emergency and Internal Medicine, Belgrade, Serbia + University of Defence, Faculty of Medicine of the Military Medical Academy, Belgrade, Serbia
3. University of Belgrade, Faculty of Medicine, Institute of Social Medicine, Belgrade, Serbia
4. Military Medical Academy, Clinic for Cardiology, Belgrade, Serbia
5. Military Medical Academy, Clinic for Emergency and Internal Medicine, Belgrade, Serbia