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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21607644-7220879> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Radiology. 1981 May;139(2):349-54" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21607644-7220879> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/7220879> .