BEGUM, J.; BEHERA, A. K. Cervical length by ultrasound as a predictor of preterm labour. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, [S. l.], v. 3, n. 3, p. 646–652, 2017. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/1020. Acesso em: 4 oct. 2025.