Name	Info	Provider	Link
	free resource	BioMed Central	https://respiratory-research.biomedcentral.com/articles/10.1186/s12931-021-01847-0
COPD	free resource	MedlinePlus Health Information	https://medlineplus.gov/copd.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/34983515/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/34983515