Name	Info	Provider	Link
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=20477583.ui
	subscription/membership/fee required	Taylor & Francis	https://www.tandfonline.com/doi/full/10.1586/1744666X.4.1.21