- Correspondence to: Dr Y Agid, Centre d'Investigation Clinique, Hôpital de la Salpêtriére, 47 Boulevard de l'Hôpital, 75013 Paris, France;
- Received May 25, 2001
- Accepted October 11, 2001
- Revised September 25, 2001
- First published June 1, 2002.
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