«Http://www.hc-sc.gc.ca/Hppb/Healthcare/index.Htm». Revista Portuguesa de Medicina Geral e Familiar 19, no. 6 (novembro 1, 2003): 642. Acedido abril 17, 2026. https://rpmgf.pt/ojs/index.php/rpmgf/article/view/10001.