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subscription/membership/fee required Ingenta plc https://www.ingentaconnect.com/openurl?genre=article&issn=0148-5717&volume=49&issue=3&spage=208&aulast=Van Gerwen
COVID-19 (Coronavirus Disease 2019) free resource MedlinePlus Health Information https://medlineplus.gov/covid19coronavirusdisease2019.html
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free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/34535613/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/34535613
subscription/membership/fee required Wolters Kluwer https://doi.org/10.1097/OLQ.0000000000001559