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This data was presented at American Academy of Ophthalmology Conference, Chicago in November 2012.
Contributors MAN: data collection, analysis, manuscript drafting and critical review. ML: critical review of the manuscript. RM: data collection, analysis, manuscript drafting and critical review.
Competing interests None.
Ethics approval Approval obtained from Audit department at Queen Victoria Hospital, East Grinstead, UK.
Provenance and peer review Not commissioned; externally peer reviewed.
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