Name	Info	Provider	Link
	free resource	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0104-0014(21)00107-X
COPD	free resource	MedlinePlus Health Information	https://medlineplus.gov/copd.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/33766684/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/33766684
	free resource	scite Smart Citations	https://scite.ai/reports/33766684