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Critical Care	free resource	MedlinePlus Health Information	https://medlineplus.gov/criticalcare.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=28622230.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/28622230/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/28622230
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	subscription/membership/fee required	Wolters Kluwer	https://doi.org/10.1097/CCM.0000000000002396