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COVID-19 (Coronavirus Disease 2019) free resource MedlinePlus Health Information https://medlineplus.gov/covid19coronavirusdisease2019.html
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=34971711.ui
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/34971711/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/34971711
subscription/membership/fee required ClinicalKey https://www.clinicalkey.com/content/playBy/pii?v=S0196-6553(21)00863-4
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