SHERAFUDEEN, S.; VISWANATH, A.; JOSEPH, S. M. Transvaginal sonographic evaluation of cervical length in the second trimester as a risk factor for preterm delivery. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, [S. l.], v. 7, n. 3, p. 921–926, 2018. DOI: 10.18203/2320-1770.ijrcog20180867. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/4125. Acesso em: 8 nov. 2025.