Name	Info	Provider	Link
	subscription/membership/fee required	Ediciones Doyma, S.L.	http://www.archbronconeumol.org/en/linksolver/ft/pii/S0300-2896(21)00025-9
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0300-2896(21)00025-9
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/34629664/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/34629664
	subscription/membership/fee required	ClinicalKey	https://www.clinicalkey.com/content/playBy/pii?v=S0300-2896(21)00025-9