Name	Info	Provider	Link
	subscription/membership/fee required	HighWire	https://ijgc.bmj.com/lookup/pmidlookup?view=long&pmid=19509544
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=19509544.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19509544/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/19509544
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:19509544