Name	Info	Provider	Link
	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=1019-6439&volume=27&issue=5&spage=1355&aulast=Kullberg
	subscription/membership/fee required	Spandidos Publications	https://www.spandidos-publications.com/ijo/27/5/1355