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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21552440-9852458> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Gastrointest Endosc. 1998 Dec;48(6):634-6" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21552440-9852458> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/9852458> .