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Singh A, Sørensen TL.Singh A, et al. Among authors: sorensen tl.Acta Ophthalmol. 2012 Aug;90(5):476-80. doi: 10.1111/j.1755-3768.2010.02051.x. Epub 2010 Nov 25.Acta Ophthalmol. 2012.PMID: 21106047Free article.