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Noor Ophthalmology Research Center (H.H., S.H., M.A.S.), Noor Eye Hospital, Tehran,
Iran; Department of Optometry (A.Y.), School of Paramedical Sciences, Mashhad University
of Medical Sciences, Mashhad, Iran; and Department of Epidemiology (M.K.), School
of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran.