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<http://linkedlifedata.com/resource/pubmed/commentcorrection/18438573-1990737> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Am Fam Physician. 1991 Feb;43(2):535-42" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/18438573-1990737> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/1990737> .
<http://linkedlifedata.com/resource/pubmed/id/18438573> <http://linkedlifedata.com/resource/pubmed/commentsCorrections> <http://linkedlifedata.com/resource/pubmed/commentcorrection/18438573-1990737> .