D., M.; R., S.; R., M. Serum β-hcg levels between 12 to 20 weeks of gestation in prediction of hypertensive disordrers of pregnancy. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, [S. l.], v. 6, n. 8, p. 3347–3351, 2017. DOI: 10.18203/2320-1770.ijrcog20173263. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/3363. Acesso em: 29 dec. 2025.