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Funding Supported in part by an unrestricted grant from That Man May See, Inc., San Francisco, California; an unrestricted grant from Research to Prevent Blindness, New York; and the National Institutes of Health (NIH) grant U10 EY015114.
Competing interests None.
Ethics approval Obtained from the University of California, San Francisco Committee on Human Research and the Aravind Eye Care System, Madurai Institutional Review Board.
Provenance and peer review Not commissioned; not externally peer reviewed.
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