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Contributors MJG and TDLK contributed to the conception of the letter. MJG wrote the letter, and all authors revised it. MJG is the guarantor.
Funding The Unit of Health-Care Epidemiology is funded by the English National Institute for Health Research to analyse the linked data. The views expressed in this paper do not necessarily reflect those of the funding body. TDLK is funded by Fight for Sight through a clinical fellowship.
Competing interests None.
Patient consent Obtained.
Ethics approval Ethics approval for analysis of the record linkage study data was obtained from the Central and South Bristol Multi-Centre Research Ethics Committee (04/Q2006/176).
Provenance and peer review Not commissioned; internally peer reviewed.
Data sharing statement No further data relating to this study are available.