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<http://linkedlifedata.com/resource/pubmed/keyword/MITRAL+VALVE%2Fsurgery> <http://linkedlifedata.com/resource/pubmed/isMajorTopic> "Y" .
<http://linkedlifedata.com/resource/pubmed/keyword/MITRAL+VALVE%2Fsurgery> <http://linkedlifedata.com/resource/pubmed/owner> "NLM" .