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<http://linkedlifedata.com/resource/pubmed/commentcorrection/1540721-2507061> <http://linkedlifedata.com/resource/pubmed/referenceSource> "BMJ. 1989 Aug 26;299(6698):533-6" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/1540721-2507061> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/2507061> .