- Correspondence to Dr Jean-Baptiste Chanson, Department de Neurologie, Hôpitaux Universitaires de Strasbourg, Hôpital de Hautepierre, 1 avenue Molière, Strasbourg 67000, France;
- Received July 22, 2012
- Revised November 18, 2012
- Accepted November 19, 2012
- First published December 15, 2012.
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