Name	Info	Provider	Link
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=21421691.ui
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:21421691
	subscription/membership/fee required	Silverchair Information Systems	https://academic.oup.com/brain/article-lookup/doi/10.1093/brain/awr022