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<http://linkedlifedata.com/resource/pubmed/commentcorrection/6215865-4971193> <http://linkedlifedata.com/resource/pubmed/referenceSource> "Can J Ophthalmol. 1968 Jul;3(3):218-30" .
<http://linkedlifedata.com/resource/pubmed/commentcorrection/6215865-4971193> <http://linkedlifedata.com/resource/pubmed/referesTo> <http://linkedlifedata.com/resource/pubmed/id/4971193> .