Name	Info	Provider	Link
COPD	free resource	MedlinePlus Health Information	https://medlineplus.gov/copd.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/29731626/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/29731626
	free resource	Dove Medical Press	https://dx.doi.org/10.2147/COPD.S156121
Full text from	free resource	Linkoping University Electronic Press	http://liu.diva-portal.org/smash/get/diva2:1209462/FULLTEXT01.pdf
	free resource	scite Smart Citations	https://scite.ai/reports/29731626