1. Department of Clinical NeurophysiologyAPHP, Pitié‐Salpêtrière Hospital Paris France
2. Medical SchoolPierre et Marie Curie University‐Paris VI Paris France
3. Department of NeurologyAPHP, Pitié‐Salpêtrière Hospital Paris France
4. Department of HaematologyAPHP, Pitié‐Salpêtrière Hospital Paris France