CARVALHO, P. M.; SOARES, S. C.; CASTRO, A. R. What did we learn after the 2020 pandemic? Seroprevalence of SARS-CoV-2 infection in a North region of Portugal during 3rd lockdown. International Journal of Research in Medical Sciences, [S. l.], v. 9, n. 9, p. 2568–2572, 2021. DOI: 10.18203/2320-6012.ijrms20213393. Disponível em: https://www.msjonline.org/index.php/ijrms/article/view/9904. Acesso em: 14 oct. 2025.