Name	Info	Provider	Link
	free resource	MDPI	https://www.mdpi.com/resolver?pii=s21238131
COVID-19 (Coronavirus Disease 2019)	free resource	MedlinePlus Health Information	https://medlineplus.gov/covid19coronavirusdisease2019.html
Free full Text at ORBi	free resource	ORBi (University of Liege)	https://hdl.handle.net/2268/290224
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/34884136/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/34884136