1. Clinic for Gynecology and Obstetrics, Neonatology, Clinical Center of Serbia, Belgrade, Serbia
2. Institute for Mother and Child Health “Dr Vukan Čupić,” Belgrade, Serbia
3. School of Medicine, University of Belgrade, Belgrade, Serbia
4. Clinic for Gynecology and Obstetrics, Perinatology, School of Medicine, Clinical Center of Serbia, Belgrade, University of Belgrade
5. Center for Anesthesia and Resuscitation, Clinical Center of Serbia, Belgrade, Serbia