Name	Info	Provider	Link
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=21175287.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21175287/
	subscription/membership/fee required	Taylor & Francis	https://www.tandfonline.com/doi/full/10.2217/rme.10.91
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/21175287
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:21175287