Name	Info	Provider	Link
	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=1019-6439&volume=28&issue=2&spage=497&aulast=Bai
	subscription/membership/fee required	Spandidos Publications	https://www.spandidos-publications.com/ijo/28/2/497