Prenatal screening for chromosomal abnormalities and neural tube defects: How should this be done?. Portuguese Journal of Family Medicine and General Practice, [S. l.], v. 25, n. 3, p. 320–31, 2009. DOI: 10.32385/rpmgf.v25i3.10628. Disponível em: https://rpmgf.pt/ojs/index.php/rpmgf/article/view/10628. Acesso em: 18 apr. 2026.