1.
Mathur S. Prediction of risk of preterm delivery by cervical assessment by trans-vaginal ultrasound. Int J Reprod Contracept Obstet Gynecol [Internet]. 2017 Feb. 23 [cited 2025 Oct. 7];5(7):2177-9. Available from: https://www.ijrcog.org/index.php/ijrcog/article/view/1322