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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/35065703/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/35065703
subscription/membership/fee required ClinicalKey https://www.clinicalkey.com/content/playBy/pii?v=S0140-6736(22)00104-0