Http://www.ncahf.org/. Portuguese Journal of Family Medicine and General Practice, [S. l.], v. 20, n. 6, p. 752, 2004. DOI: 10.32385/rpmgf.v20i6.10104. Disponível em: https://rpmgf.pt/ojs/index.php/rpmgf/article/view/10104. Acesso em: 18 apr. 2026.