Low Maternal Serum Folic Acid as Risk Factor of Preterm Delivery. European Journal of Medical and Health Sciences, [S. l.], v. 5, n. 2, p. 37–40, 2023. DOI: 10.24018/ejmed.2023.5.2.1617. Disponível em: https://ej-med.org/index.php/ejmed/article/view/1617. Acesso em: 10 oct. 2025.