1. Department of Obstetrics and Gynaecology, Dışkapı Yıldırım Beyazıt Training and Research Hospital, Ankara, Turkey;
2. Department of Obstetrics and Gynaecology, Umraniye Training and Research Hospital, Istanbul, Turkey;
3. Department of Pathology, Medipol University Hospital, Istanbul, Turkey;
4. Department of Obstetrics and Gynaecology, Bezmialem University Hospital, Istanbul, Turkey