1. Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
2. University Clinical Center of Serbia, 11000 Belgrade, Serbia
3. University Hospital Medical Center “Bezanijska Kosa”, 11080 Belgrade, Serbia
4. Faculty of Medical Science, University of Kragujevac, 34000 Kragujevac, Serbia
5. University Clinical Center of Kragujevac, 34000 Kragujevac, Serbia
6. Clinical Hospital Center Zemun, 11080 Belgrade, Serbia
7. Faculty of Medicine, University of Kosovksa Mitrovica, 11000 Belgrade, Serbia
8. Institute for Cardiovascular Diseases “Dedinje”, 111040 Belgrade, Serbia
9. University Hospital “Dragisa Misovic”, 11000 Belgrade, Serbia
10. Institute for Orthopedic Diseases “Banjica”, 11000 Belgrade, Serbia
11. Military Medical Academy, 11040 Belgrade, Serbia
12. Special Hospital for Cerebrovascular Diseases “Saint Sava”, 11000 Belgrade, Serbia