Name	Info	Provider	Link
Heart Surgery	free resource	MedlinePlus Health Information	https://medlineplus.gov/heartsurgery.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=19127355.ui
	subscription/membership/fee required	Springer	https://dx.doi.org/10.1007/s00134-008-1391-2