Saini R, Yadav R, Pathak B. Use of cervical length, measured by transvaginal sonography at 22 to 26 weeks, as a predictor of preterm labour in twin pregnancy. Int J Reprod Contracept Obstet Gynecol [Internet]. 2018 Aug. 27 [cited 2025 Oct. 12];7(9):3590-5. Available from: https://www.ijrcog.org/index.php/ijrcog/article/view/5435