01. Vitale S, Ellwein L, Cotch MF, Ferris FL 3rd, Sperduto R. Prevalence of refractive error in the United States, 199-2004. Arch Ophthalmol 2008; 126: 1111-9.

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01. Vitale S, Ellwein L, Cotch MF, Ferris FL 3rd, Sperduto R. Prevalence of refractive error in the United States, 199-2004. Arch Ophthalmol 2008; 126: 1111-9.