1. Division of Paediatric Neurology, Department of Paediatrics, Lille Faculty of Medicine and Children's Hospital, Lille
2. Department of Neurosurgery, Timone Hospital, Marseille
3. Department of Neurology
4. Laboratoire GlaxoSmithKline, Marly-le-Roi, France
5. Department of Neurophysiology, Rouen University Hospital, Rouen Cedex
6. See Appendix