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