Name	Info	Provider	Link
COPD	free resource	MedlinePlus Health Information	https://medlineplus.gov/copd.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=17874272.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/17874272/
	subscription/membership/fee required	Springer	https://dx.doi.org/10.1007/s11606-007-0354-6
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/17874272