1. Clinical Centre of Serbia, Clinic for Gynecology and Obstetrics, Belgrade, Serbia
2. Faculty of Medicine, University of Belgrade, Belgrade, Serbia
3. Clinic for Gynecology and Obstetrics “Narodni front”, Belgrade, Serbia
4. Laboratory for Cellular Physiology, Institute of Medical Physiology, Faculty of Medicine, University of Belgrade, Belgrade, Serbia
5. University of Haifa, Haifa, Israel
6. Department for Medical Statistics and Informatics, Faculty of Medicine, University of Belgrade, Belgrade, Serbia