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<http://webisa.webdatacommons.org/352631296>	<http://www.w3.org/ns/prov#value>	"Bagno Andrea - - 2009 Heart valve disorders, caused by congenital defects, rheumatic fever, calcification, myocardial infarction and other cardiovascular diseases, often require native valves to be replaced by bio-prosthetic devices or mechanical heart valves (MHVs)." .
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