Name	Info	Provider	Link
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/26835508/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/26835508
	free resource	COPD Foundation	https://doi.org/10.15326/jcopdf.3.1.2015.0144
	free resource	scite Smart Citations	https://scite.ai/reports/26835508