Submitted on: 25 September 2003.
Revised on: 08 December 2003.
Accepted on: 13 January 2004.
___________________BMC Neurology---BMC
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Submitted on: 06 December 2000.
Revised on: 30 March 2001.
Accepted on: 24 May 2001.
___________________BMC Neurology---BMC
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Submitted on: 26 March 2003.
Revised on: 18 July 2003.
Accepted on: 20 August 2003.
___________________BMC Neurology---BMC
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