Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/7/2/E421
	free resource	HighWire	http://cmajopen.ca/cgi/pmidlookup?view=long&pmid=31227484
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/31227484/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/31227484
	subscription/membership/fee required	ClinicalKey	https://www.clinicalkey.com/content/playBy?issn=2291-0026&vol=7&issue=2&pgfirst=E421