The need to strengthen Primary Health Care in Brazil in the context of the COVID-19 pandemic. SciELO Preprints, 2020. DOI: 10.1590/1807-3107bor-2020.vol34.0047. Disponível em: https://preprints.scielo.org/index.php/scielo/preprint/view/390. Acesso em: 21 jun. 2026.