The impact of vaccination on transmission and death by COVID-19: an observational study in Portugal’s biggest primary care cluster. Journal of Statistics on Health Decision, [S. l.], v. 4, n. 2, p. e27772, 2022. DOI: 10.34624/jshd.v4i2.27772. Disponível em: https://proa.ua.pt/index.php/jshd/article/view/27772. Acesso em: 13 fev. 2026.