Name	Info	Provider	Link
	subscription/membership/fee required	HighWire	https://thorax.bmj.com/lookup/pmidlookup?view=long&pmid=21724748
Older Adult Health	free resource	MedlinePlus Health Information	https://medlineplus.gov/olderadulthealth.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=21724748.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21724748/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/21724748