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Contributors Both authors participated in the conception and design, acquisition of data, analysis and interpretation of data. We both drafted the article and have given final approval to the submitted version of the paper.
Funding This work was supported by an unrestricted grant to the Department of Ophthalmology from Research to Prevent Blindness, New York and Mayo Foundation, Rochester, MN.
Competing interests None.
Ethics approval Ethics approval provided by the Mayo Institutional Review Board.
Provenance and peer review Not commissioned; externally peer reviewed.