1. Department of Obstetrics and Gynecology, Dr. Zekai Tahir Burak Women's Health Education and Research Hospital, University of Health Sciences, Ankara, Turkey;
2. Department of Clinical Biochemistry, Ankara Numune Training and Research Hospital, University of Health Sciences, Ankara, Turkey;
3. Department of Clinical Biochemistry, Faculty of Medicine, Yildirim Beyazit University, Ankara, Turkey;