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<http://linkedlifedata.com/resource/pubmed/commentcorrection/18248405-10284091> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Am Econ Rev. 1987 Jun;77(3):251-77" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/18248405-10284091> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/10284091> .