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Funding: Pim de Graaf is financially supported in part by grants from the ODAS Foundation, Delft, Netherlands; the National Foundation for the Blind and Visually Impaired, Utrecht, Netherlands; the Blindenhulp Foundation, ‘s Gravenhage, Netherlands; the Dutch Eye Fund, Utrecht, Netherlands (grant 2004–23).
Competing interest statement: The authors have no competing interests to declare.
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