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<http://linkedlifedata.com/resource/pubmed/commentcorrection/3887402-6939922> <http://linkedlifedata.com/resource/pubmed/referenceSource> "J Natl Cancer Inst. 1981 Apr;66(4):761-8" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/3887402-6939922> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/6939922> .