Name	Info	Provider	Link
	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=1021-335X&volume=22&issue=5&spage=1189&aulast=Long
	subscription/membership/fee required	Spandidos Publications	https://www.spandidos-publications.com/or/22/5/1189
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:19787239