1. Faculty of Medicine, Institute of Epidemiology, University of Belgrade, Belgrade, Serbia
2. Faculty of Medicine, Institute of Medical Statistics and Informatics, University of Belgrade, Belgrade, Serbia
3. Faculty of Medicine, Institute of Hygiene and Medical Ecology, University of Belgrade, Belgrade, Serbia
4. Department of Vascular Surgery, Dedinje Cardiovascular Institute, Belgrade, Serbia
5. Faculty of Medicine, University of Belgrade, Belgrade, Serbia