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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21523211-12472995> <http://linkedlifedata.com/resource/pubmed/referenceSource> "J Clin Periodontol. 2002 Nov;29(11):1023-8" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21523211-12472995> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/12472995> .