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	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=0003-3022&volume=138&issue=1&spage=42&aulast=McKenzie
Medicare	free resource	MedlinePlus Health Information	https://medlineplus.gov/medicare.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=36227278.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/36227278/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/36227278
	free resource	Silverchair Information Systems	https://pubs.asahq.org/anesthesiology/article-lookup/doi/10.1097/ALN.0000000000004404