Opportunistic detection of colorectal cancer by the family doctor. Portuguese Journal of Family Medicine and General Practice, [S. l.], v. 23, n. 3, p. 269–76, 2007. DOI: 10.32385/rpmgf.v23i3.10359. Disponível em: https://rpmgf.pt/ojs/index.php/rpmgf/article/view/10359. Acesso em: 18 apr. 2026.