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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/32907660/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/32907660
subscription/membership/fee required Cambridge University Press https://www.cambridge.org/core/product/identifier/S1935789320003420/type/journal_article