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The prevalence and causes of visual impairment in seven-year-old children

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General Info
Geography 
Ardabīl, Hormozgān
Khorāsān-e Jonūbī, Khorāsān-e Raẕavī, Khūzestān, Markazī, Māzandarān, Yazd
Time period covered 
01/2013 - 12/2013