The asymmetries of first-trimester combined screening of pregnancy in Portugal. Portuguese Journal of Family Medicine and General Practice, [S. l.], v. 41, n. 3, p. 278–82, 2025. DOI: 10.32385/rpmgf.v41i3.13144. Disponível em: https://rpmgf.pt/ojs/index.php/rpmgf/article/view/13144. Acesso em: 18 apr. 2026.