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subscription/membership/fee required Elsevier Science https://linkinghub.elsevier.com/retrieve/pii/S1871-4021(21)00140-5
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/34186377/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/34186377
Anxiety free resource MedlinePlus Consumer Health Information https://medlineplus.gov/anxiety.html