Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0360-3016(20)34501-6
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/33227443/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/33227443
	subscription/membership/fee required	ClinicalKey	https://www.clinicalkey.com/content/playBy/pii?v=S0360-3016(20)34501-6
	free resource	scite Smart Citations	https://scite.ai/reports/33227443