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<http://linkedlifedata.com/resource/pubmed/commentcorrection/21666324-7369319> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Am J Ophthalmol. 1980 Apr;89(4):553-9" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/21666324-7369319> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/7369319> .