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<http://linkedlifedata.com/resource/pubmed/commentcorrection/18158332-68942> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Invest Ophthalmol Vis Sci. 1977 Jul;16(7):640-4" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/18158332-68942> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/68942> .