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<http://linkedlifedata.com/resource/pubmed/commentcorrection/690169-1249401> <http://linkedlifedata.com/resource/pubmed/referenceSource> "J Gerontol. 1976 Mar;31(2):135-43" .
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<http://linkedlifedata.com/resource/pubmed/id/690169> <http://linkedlifedata.com/resource/pubmed/commentsCorrections> <http://linkedlifedata.com/resource/pubmed/commentcorrection/690169-1249401> .