1. School of Medicine, University of Belgrade, Belgrade, Serbia;
2. Clinic for Gynecology and Obstetrics, Clinical Centre of Serbia, Belgrade, Serbia;
3. Department of Obstetrics and Gynaecology, Shrewsbury and Telford Hospitals, NHS Trust, Telford, UK;
4. Department for Histopathology, Clinical Center of Serbia, Belgrade, Serbia;
5. Department of Midwifery, Midwifery School, “Alexander” Technological Educational Institute of Thessaloniki, Thessaloniki, Greece;
6. Clinic for Gynecology and Obstetrics “Narodni Front”, Belgrade, Serbia