Tohma, Yusuf Aytaç, Mehmet Metin Altay, Derya Turgut, Selcan Coşkun, Eylem Ünlübilgin, Sertaç Esin, Orhan Gelişen, and Okyar Erol. 2014. “Second Trimester Umbilical Cord Coiling Index and Perinatal Outcomes”. Gynecology Obstetrics &Amp; Reproductive Medicine 20 (3). Ankara, TR:135-42. https://www.gorm.com.tr/index.php/GORM/article/view/159.