Name	Info	Provider	Link
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=25500264.ui
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	subscription/membership/fee required	Silverchair Information Systems	https://academic.oup.com/eurpub/article-lookup/doi/10.1093/eurpub/cku206