Eraslan Sahin , M., M. M. Kirlangic, I. Col Madendag, and M. Ak. “Is a First-Trimester Subchorionic Hematoma and Its Size a Risk for Preterm Premature Rupture of Membranes?”. Annals of Medical Research, vol. 29, no. 5, May 2022, pp. 483-6, http://www.annalsmedres.org/index.php/aomr/article/view/4098.