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The Global Burden of Visual Difficulty in Low, Middle, and High Income Countries
Freeman EE,
Roy-Gagnon MH,
Samson E,
Haddad S,
Aubin MJ,
et al.
(2013)
The Global Burden of Visual Difficulty in Low, Middle, and High Income Countries.
PLOS ONE 8(5): e63315.
https://doi.org/10.1371/journal.pone.0063315