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<http://linkedlifedata.com/resource/pubmed/commentcorrection/4720764-4301906> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Am J Dig Dis. 1968 Dec;13(12):1027-34" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/4720764-4301906> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/4301906> .