1. Institute of Epidemiology, Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
2. Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
3. Clinic for Obstetrics and Gynecology, University Clinical Center of Serbia, 11000 Belgrade, Serbia
4. Institute of Public Health of Serbia “Dr. Milan Jovanovic Batut”, 11000 Belgrade, Serbia
5. Department of Epidemiology, Faculty of Medicine, University of Pristina Temporarily Seated in Kosovska Mitrovica, 38220 Kosovska Mitrovica, Serbia
6. Department of Humanities, Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
7. Primary Health Care Center “Zemun”, 11000 Belgrade, Serbia