Name	Info	Provider	Link
Breathing Problems	free resource	MedlinePlus Health Information	https://medlineplus.gov/breathingproblems.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=19906690.ui
Cited by Patents in	free resource	The Lens - Patent Citations Database	https://www.lens.org/lens/search/patent/list?q=reference_cited.nlp.ids.pmid:19906690
	subscription/membership/fee required	Silverchair Information Systems	https://academic.oup.com/eurheartj/article-lookup/doi/10.1093/eurheartj/ehp458