- Correspondence to: Stefano C. Previtali Department of Neurology, San Raffaele Scientific Institute, Via Olgettina 60, 20132 Milano, Italy;
- Received 21 May 2004
- Accepted 13 October 2004
- Revised 9 September 2004
- Published in print 1 July 2005.
- Published online 16 June 2005.
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