Name	Info	Provider	Link
	subscription/membership/fee required	Atypon	https://www.atsjournals.org/doi/10.1164/rccm.201502-0245IM?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub 0pubmed
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=26230237.ui
Full text from	free resource	Diposit Digital de la Universitat de Barcelona	http://hdl.handle.net/2445/99553