1. Department of Cardiovascular Diseases, Clinical Center, Medical Faculty, Niš
2. Department of Anesthesiology and Intensive Care, Institute for Mother and Child Health Care of Serbia „Dr Vukan Čupić”, Belgrade
3. Medical Faculty, Niš
4. Institute of Cardiovascular Diseases of Vojvodina, Sremska Kamenica
5. University of Defence, Faculty of Medicine of the Military Medical Academy, Belgrade + Clinic of Emergency Medicine, Military Medical Academy, Belgrade
6. Department of Cardiology, University Hospital Medical Center “Bežanijska kosa”, Faculty of Medicine, Belgrade