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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21209902-19630954> <http://linkedlifedata.com/resource/pubmed/referenceSource> "BMC Public Health. 2009;9:261" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21209902-19630954> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/19630954> .