1. Military Medical Academy, Clinic for Emergency Internal Medicine, Belgrade, Serbia + University of Defence, Faculty of Medicine of the Military Medical Academy, Belgrade, Serbia
2. Military Medical Academy, Clinic for Emergency Internal Medicine, Belgrade, Serbia
3. Military Medical Academy, Clinic for Cardiology, Belgrade, Serbia
4. University of Defence, Faculty of Medicine of the Military Medical Academy, Belgrade, Serbia + Military Medical Academy, Clinic for Cardiology, Belgrade, Serbia