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<http://linkedlifedata.com/resource/pubmed/commentcorrection/9227301-1776596> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Age Ageing. 1991 Nov;20(6):449-54" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/9227301-1776596> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/1776596> .