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subscription/membership/fee required Atypon https://www.atsjournals.org/doi/10.1164/rccm.201002-0301OC?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub 0pubmed
Disabilities free resource MedlinePlus Health Information https://medlineplus.gov/disabilities.html
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=21057004.ui
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21057004/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/21057004