1. Department of Obstetrics and Gynecology, University of Health and Science, Istanbul, Turkey;
2. General Directorate of Mother and Child Health and Family Planning, Ministry of Health of Turkey, Ankara, Turkey;
3. Department of Obstetrics and Gynecology, Atatürk Education and Research Hospital, Ankara, Turkey;
4. Dr Zekai Tahir Burak Training and Research Hospital, Ankara, Turkey