Submitted on: 28 April 2015.
Revised on: 25 May 2015.
Accepted on: 19 July 2015.
___________________BMJ Open Ophthalmology---BMJ PUBLISHING GROUP
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Submitted on: 11 March 2004.
Revised on: 12 April 2004.
Accepted on: 05 June 2004.
___________________BMJ Open Ophthalmology---BMJ PUBLISHING GROUP
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Submitted on: 29 May 2010.
Revised on: 10 September 2010.
Accepted on: 02 November 2010.
___________________BMJ Open Ophthalmology---BMJ PUBLISHING GROUP
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Submitted on: 09 November 2000.
Revised on: 28 January 2001.
Accepted on: 11 February 2001.
___________________BMJ Open Ophthalmology---BMJ PUBLISHING GROUP