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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21772849-1697189> <http://linkedlifedata.com/resource/pubmed/referenceSource> "BMJ. 1990 Aug 4;301(6746):277-81" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21772849-1697189> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/1697189> .