Submitted on: 16 June 2002.
Revised on: 08 August 2002.
Accepted on: 31 August 2002.
___________________International Journal of Ophthalmology
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Submitted on: 10 December 2002.
Revised on: 14 March 2003.
Accepted on: 23 April 2003.
___________________International Journal of Ophthalmology
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