1. Faculty of Medicine, Clinical Center Niš, Department of Cardiovascular Diseases, Niš
2. Clinical Center of Serbia, Institute of Cardiovascular Disease, Belgrade
3. Faculty of Medicine, Clinical Center Niš, Department of Medical Biochemistry, Niš
4. Faculty of Medicine, University Hospital Medical Center Bežanijska kosa, Department of Cardiology, Belgrade
5. Institute of Medical Biochemistry, Niš