1. Department of Obstetrics and Gynecology, Dr. Sami Ulus Maternity and Children's Health and Diseases Training and Research Hospital, Ankara, Turkey;
2. Department of Obstetrics and Gynecology, Ufuk University Faculty of Medicine, Ankara, Turkey;
3. Department of Anesthesiology and Reanimation, Ufuk University Faculty of Medicine, Ankara, Turkey;
4. Department of Biochemistry, Ufuk University Faculty of Medicine, Ankara, Turkey