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D002648:Child; D002669:Child Welfare; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D009907:Optometry / Q000379:methods*; D017410:Practice Guidelines as Topic; D012574:Schools; D014786:Vision Disorders / Q000175:diagnosis* / Q000534:rehabilitation*; D015351:Vision Screening / Q000379:methods