TORVALDSEN, Siranda; MCINTYRE, Peter B. Observational methods in epidemiologic assessment of vaccine effectiveness. Communicable Diseases Intelligence, [S. l.], v. 26, p. 451–457, 2002. DOI: 10.33321/cdi.2002.26.43. Disponível em: https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/2557. Acesso em: 6 apr. 2026.