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	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19443809/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/19443809
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:19443809
	subscription/membership/fee required	Wolters Kluwer	https://journals.lww.com/19443809.pmid