1. Department of Perinatology, Buca Maternity Hospital, Buca, Izmir, Turkey;
2. Department of Obstetrics and Gynecology, University of Health Sciences, Tepecik Training and Research Hospital, Konak, Izmir, Turkey;
3. Medical Biochemistry Department, University of Health Sciences, Tepecik Training and Research Hospital, Konak, Izmir, Turkey;
4. Department of Biostatistics, Faculty of Medicine, Dokuz Eylul University, Balcova, Izmir, Turkey;
5. Division of Perinatology, Department of Obstetrics and Gynecology, Dokuz Eylul University School of Medicine, Balcova, Izmir, Turkey