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Submitted on: 22 February 1998.
Revised on: 08 June 1998.
Accepted on: 19 June 1998.
___________________BRITISH JOURNAL OF OPHTHALMOLOGY
Submitted on: 15 August 2016.
Revised on: 17 October 2016.
Accepted on: 28 November 2016.
___________________BRITISH JOURNAL OF OPHTHALMOLOGY
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Submitted on: 23 April 2023.
Revised on: 22 May 2023.
Accepted on: 10 July 2023.
___________________BRITISH JOURNAL OF OPHTHALMOLOGY
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