Name	Info	Provider	Link
	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=&volume=12&issue=2&spage=1963&aulast=Guo
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=25845379.ui
	subscription/membership/fee required	Spandidos Publications	https://www.spandidos-publications.com/mmr/12/2/1963