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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21170578-9254435> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Salud Publica Mex. 1997 Mar-Apr;39(2):117-24" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21170578-9254435> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/9254435> .