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Heart Attack	free resource	MedlinePlus Health Information	https://medlineplus.gov/heartattack.html
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Full text from	free resource	Linkoping University Electronic Press	http://liu.diva-portal.org/smash/get/diva2:1557061/FULLTEXT01.pdf
	free resource	scite Smart Citations	https://scite.ai/reports/33550362
	subscription/membership/fee required	Silverchair Information Systems	https://academic.oup.com/ehjacc/article-lookup/doi/10.1093/ehjacc/zuaa037