Submitted on: 10 December 1998.
Revised on: 03 January 1999.
Accepted on: 14 January 1999.
___________________JAMA Ophthalmology---AMER MEDICAL ASSOC
Submitted on: 16 July 2010.
Revised on: 12 October 2010.
Accepted on: 17 November 2010.
___________________JAMA Ophthalmology---AMER MEDICAL ASSOC
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