- Correspondence to Dr Pierre-François Pradat, Fédération des Maladies du Système Nerveux, Bât Paul Castaigne, Hôpital Pitié-Salpêtrière, 83 bd de l'Hôpital, 75013 Paris, France;
- Received February 10, 2010
- Revised March 13, 2010
- Accepted March 22, 2010
- First published June 18, 2010.
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