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COVID-19 (Coronavirus Disease 2019) free resource MedlinePlus Health Information https://medlineplus.gov/covid19coronavirusdisease2019.html
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/33787663/
free resource Scientific Electronic Library Online https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-45082021000100952&lng=en&nrm=iso&tlng=en
free resource Europe PubMed Central https://europepmc.org/abstract/MED/33787663
free resource scite Smart Citations https://scite.ai/reports/33787663