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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21549017-18000274> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Can Fam Physician. 2007 Nov;53(11):1956-7" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21549017-18000274> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/18000274> .