Name	Info	Provider	Link
	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=&volume=137&issue=6&spage=1056e&aulast=Placik
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=26890518.ui
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	subscription/membership/fee required	Wolters Kluwer	https://doi.org/10.1097/PRS.0000000000002203