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Funding Fight for Sight, British Retinitis Pigmentosa Society, Ulverscroft foundation, Foundation Fighting Blindness USA, National Institute for Health Research (NIHR—Moorfields Biomedical Research Centre).
Competing interests None.
Patient consent Obtained.
Ethics approval Ethics approval was provided by the Moorfields Research Ethics Committee Approval Number (MOA1005).
Provenance and peer review Not commissioned; externally peer reviewed.