Submitted on: 17 November 2000.
Revised on: 11 December 2000.
Accepted on: 28 January 2001.
___________________BRITISH JOURNAL OF OPHTHALMOLOGY
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Submitted on: 12 April 2007.
Revised on: 17 July 2007.
Accepted on: 26 August 2007.
___________________BRITISH JOURNAL OF OPHTHALMOLOGY
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Submitted on: 14 June 2004.
Revised on: 30 July 2004.
Accepted on: 17 August 2004.
___________________BRITISH JOURNAL OF OPHTHALMOLOGY
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Submitted on: 09 November 2005.
Revised on: 15 February 2006.
Accepted on: 15 March 2006.
___________________BRITISH JOURNAL OF OPHTHALMOLOGY