Name	Info	Provider	Link
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=21239969.ui
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:21239969
	free resource	Silverchair Information Systems	https://pubs.asahq.org/anesthesiology/article-lookup/doi/10.1097/ALN.0b013e3182054d22