- Correspondence to: Dr B Ravina Program Director, Clinical Trials, NINDS, Neuroscience Center Rm 2225, 6001 Executive Blvd, Rockville, MD 20892-9257, USA;
- Received 26 July 2004
- Accepted 17 December 2004
- Revised 9 December 2004
- Published in print 1 July 2005.
- Published online 16 June 2005.
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