1. Military Medical Academy, Clinic for Neurology, Belgrade, Serbia + Military Medical Academy, University of Defence, Faculty of Medicine of the Military Medical Academy, Belgrade, Serbia
2. Military Medical Academy, University of Defence, Faculty of Medicine of the Military Medical Academy, Belgrade, Serbia + Military Medical Academy, Clinic for Thoracic Surgery, Belgrade, Serbia
3. Military Medical Academy, University of Defence, Faculty of Medicine of the Military Medical Academy, Belgrade, Serbia + Military Medical Academy, Clinic for Anesthesiology and Intensive Care, Belgrade, Serbia