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free resource Elsevier Science https://linkinghub.elsevier.com/retrieve/pii/S2589-7500(21)00002-9
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/33509387/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/33509387
subscription/membership/fee required ClinicalKey https://www.clinicalkey.com/content/playBy/pii?v=S2589-7500(21)00002-9
free resource scite Smart Citations https://scite.ai/reports/33509387