Name	Info	Provider	Link
	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=1021-335X&volume=5&issue=2&spage=381&aulast=Freire-Garabal
	subscription/membership/fee required	Spandidos Publications	https://www.spandidos-publications.com/or/5/2/381