Name	Info	Provider	Link
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=21593640.ui
	subscription/membership/fee required	Wiley	https://onlinelibrary.wiley.com/doi/10.1097/MPG.0b013e3182128512
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:21593640
	subscription/membership/fee required	Wolters Kluwer	https://doi.org/10.1097/MPG.0b013e3182128512