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	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=0891-3668&volume=36&issue=8&spage=774&aulast=Greenberg
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=28709162.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/28709162/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/28709162
	free resource	scite Smart Citations	https://scite.ai/reports/28709162
	subscription/membership/fee required	Wolters Kluwer	https://doi.org/10.1097/INF.0000000000001570