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Prevalence of Refractive Error in the United States, 1999-2004 Arch Ophthalmol.
2008;126(8):1111-1119.
eTable. Prevalence of Any Clinically Important Refractive Error (Myopia, Hyperopia, and/or Astigmatism) by Race/Ethnicity, Sex, and Age, 1999-2004 National Health and Nutrition Examination Survey