1. Department of Obsterics and Gynecology, Zeynep Kamil Maternity and Children's Training and Research Hospital, Istanbul, Turkey;
2. Department of Obstetrics and Gynecology, Gazi University Faculty of Medicine, Ankara, Turkey;
3. Department of Obstetrics and Gynecology, Cekirge Hospital Bursa, Bursa, Turkey;
4. Department of Biochemistry, Yildirim Beyazit University, Faculty of Medicine, Ankara, Turkey