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  • 0 (xsd:integer)
nif:broaderContext
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  • 207 (xsd:integer)
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  • All children had distance VA measured, with or without spectacles, using the Early Treatment Diabetic Retinopathy Study (ETDRS) visual acuity chart (Precision, Vision, LaSalle, IL, USA) at a distance of 4 m.
rdf:type