1. Department of Obstetrics and Gynecology, Division of Perinatology, Faculty of Medicine, Suleyman Demirel University, Isparta, Turkey,
2. Department of Obstetrics and Gynecology, Isparta Maternity and Children's Hospital, Isparta, Turkey,
3. Department of Obstetrics and Gynecology, Etlik Zubeyde Hanim Maternity and Women's Health Teaching and Research Hospital, Ankara, Turkey, and
4. Department of Obstetrics and Gynecology, Zekai Tahir Burak Maternity and Women's Health Teaching and Research Hospital, Ankara, Turkey