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	subscription/membership/fee required	Atypon	https://www.ahajournals.org/doi/10.1161/CIRCULATIONAHA.113.005223?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub 0pubmed
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	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24744275/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/24744275
	free resource	scite Smart Citations	https://scite.ai/reports/24744275