1. Department for Cardiovascular Diseases, University Clinical Centre Nis, Nis, Serbia
2. Faculty of Medicine, University of Nis, Niš, Serbia
3. Department for Cardiovascular Diseases, Institute for Treatment and Rehabilitation Niska Banja, Nis, Serbia
4. Department for Cardiovascular Diseases, University Clinical Centre of Serbia, Belgrade, Serbia
5. Clinic for Internal Diseases InterMedica, Cardiology Department, Hypertension Center, Nis, Serbia
6. School of Medicine, Singidunum University, Belgrade, Serbia