Name	Info	Provider	Link
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=10819667.ui
	subscription/membership/fee required	Silverchair Information Systems	https://publications.aap.org/pediatrics/article-lookup/doi/10.1542/peds.105.4.915-a