Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S1094-7159(10)60078-5
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=21992761.ui
	subscription/membership/fee required	Wiley	https://doi.org/10.1111/j.1525-1403.2009.00231.x