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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21714384-5644201> <http://linkedlifedata.com/resource/pubmed/referenceSource> "J Natl Cancer Inst. 1968 Mar;40(3):453-63" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21714384-5644201> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/5644201> .