1. Institute of Epidemiology, Faculty of Medicine, University of Belgrade, Belgrade, Serbia
2. Department of Humanities, Faculty of Medicine, University of Belgrade, Belgrade, Serbia
3. Institute of Public Health of Serbia “Dr Milan Jovanovic Batut”, Belgrade, Serbia
4. Department of Epidemiology, Faculty of Medicine, University of Pristina temporarily seated in Kosovska Mitrovica, Kosovska Mitrovica, Kosovo, Serbia
5. Clinic for Obstetrics and Gynecology, Clinical Center of Serbia, Belgrade, Serbia
6. Faculty of Medicine, University of Belgrade, Belgrade, Serbia