Name	Info	Provider	Link
	free resource	BioMed Central	https://bmcpulmmed.biomedcentral.com/articles/10.1186/s12890-016-0305-2
COPD	free resource	MedlinePlus Health Information	https://medlineplus.gov/copd.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/27835945/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/27835945
	free resource	scite Smart Citations	https://scite.ai/reports/27835945