Adequacy of risk classification protocols for COVID-19 to WHO guidelines: a proposed instrument. SciELO Preprints, 2020. DOI: 10.1590/SciELOPreprints.1208. Disponível em: https://preprints.scielo.org/index.php/scielo/preprint/view/1208. Acesso em: 11 nov. 2026.