1. Obstetrics and Gynecology, School of Medicine, University of Belgrade, Belgrade, Serbia
2. Clinical Center of Serbia, Institute of Obstetrics and Gynecology, School of Medicine, University of Belgrade, Belgrade, Serbia
3. Clinical Center of Serbia, Institute of Obstetrics and Gynecology, Belgrade, Serbia
4. General Health Center “Savski Venac”, Belgrade, Serbia
5. Ultramedica Clinic, American Medical Academy, Belgrade, Serbia
6. Department of Anesthesiology, University of Illinois; Department of Anesthesiology, Advocate Illinois Masonic Medical Center, Chicago, United States