1. Department of Obstetrics and Gynecology, Yildirim Beyazit University, Bilkent, 06800 Ankara, Turkey
2. Department of Obstetrics and Gynecology, Ankara Ataturk Training and Research Hospital, Bilkent, 06800 Ankara, Turkey
3. Department of Pathology, Ankara Ataturk Training and Research Hospital, Bilkent, 06800 Ankara, Turkey