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The Decreasing Prevalence of Nonrefractive Visual Impairmen..:

Delcourt, Cécile ; Le Goff, Mélanie ; von Hanno, Therese...
https://researchonline.lshtm.ac.uk/id/eprint/4647075/1/The%20decreasing%20prevalence_GREEN%20AAM.pdf.  , 2018