1. Department of Obstetrics and Gynecology, Faculty of Medicine, Istanbul University Cerrahpasa, Istanbul, Turkey;
2. Department of Obstetrics and Gynecology, Division of Perinatology, Faculty of Medicine, Istanbul University Cerrahpasa, Istanbul, Turkey;
3. Department of Radiology, Faculty of Medicine, Istanbul University Cerrahpasa, Istanbul, Turkey;
4. Department of Pathology, Faculty of Medicine, Istanbul University Cerrahpasa, Istanbul, Turkey