- C Pierrot-Deseilligny, Service de Neurologie 1, Hôpital de la Pitié-Salpêtrière, 47 Boulevard de l'Hôpital, 75651 Paris Cedex 13, France
- Received December 10, 1999
- Revised October 19, 2000
- Accepted October 26, 2000
- First published February 1, 2001.
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