1. Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
2. Clinic of Cardiology, Clinical Centre of Serbia, 11000 Belgrade, Serbia
3. Clinic of Neurology, Clinical Centre of Serbia, 11000 Belgrade, Serbia
4. Institute of Medical and Clinical Biochemistry, 11000 Belgrade, Serbia
5. Clinic of Infectious and Tropical Diseases, Clinical Centre of Serbia, 11000 Belgrade, Serbia
6. Department of Medical Sciences, Serbian Academy of Sciences and Arts, 11000 Belgrade, Serbia
7. Institute of Medical Statistics and Informatics, 11000 Belgrade, Serbia