1. Clinic of Obstetrics and Gynecology, Clinical Center of Serbia, Belgrade, Serbia;
2. Medical Faculty, University of Belgrade, Belgrade, Serbia;
3. Department of Medicine, Nazarbayev University, Astana, Kazakhstan;
4. Department of Obstetrics, Gynecology and Reproductive Sciences, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA;
5. Department of Obstetrics and Gynecology, National Research Center of Mother and Child Health, University Medical Center, Astana, Kazakhstan