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<http://linkedlifedata.com/resource/pubmed/commentcorrection/1540721-2504376> <http://linkedlifedata.com/resource/pubmed/referenceSource> "BMJ. 1989 Jul 22;299(6693):230-3" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/1540721-2504376> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/2504376> .