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Submitted on: 30 July 1998.
Revised on: 05 October 1998.
Accepted on: 14 November 1998.
___________________Current Neurology and Neuroscience Reports
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Submitted on: 30 September 2007.
Revised on: 04 December 2007.
Accepted on: 07 January 2008.
___________________Current Neurology and Neuroscience Reports
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Submitted on: 13 November 2003.
Revised on: 20 February 2004.
Accepted on: 15 March 2004.
___________________Current Neurology and Neuroscience Reports