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	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=1791-2997&volume=11&issue=1&spage=219&aulast=Liao
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=25338516.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/25338516/
	subscription/membership/fee required	Spandidos Publications	https://www.spandidos-publications.com/mmr/11/1/219
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/25338516
	free resource	scite Smart Citations	https://scite.ai/reports/25338516