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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21523215-12656994> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Periodontol 2000. 2003;31:32-42" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21523215-12656994> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/12656994> .