Name	Info	Provider	Link
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21930502/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/21930502
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:21930502
	free resource	Silverchair Information Systems	https://academic.oup.com/database/article-lookup/doi/10.1093/database/bar026