GUPTA, R.; MUKHERJEE, P.; KAUR, H.; SINGHAL, S. Role of cervicovaginal β-hCG in prediction of preterm delivery: a prospective observational study. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, [S. l.], v. 9, n. 9, p. 3677–3682, 2020. DOI: 10.18203/2320-1770.ijrcog20203839. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/8722. Acesso em: 14 oct. 2025.