Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/6/2/E197
	free resource	HighWire	http://cmajopen.ca/cgi/pmidlookup?view=long&pmid=29716916
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/29716916/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/29716916
	free resource	scite Smart Citations	https://scite.ai/reports/29716916