Name	Info	Provider	Link
	subscription/membership/fee required	Atypon	https://cdnsciencepub.com/doi/10.1139/y06-021?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub 0pubmed
	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=0008-4212&volume=84&issue=7&spage=765&aulast=Barrio
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=16998540.ui