1. Department of Neurology and Clinical Neurophysiology; Elisabeth-Tweesteden Hospital; Tilburg The Netherlands
2. Brain Center Rudolf Magnus, Department of Neurology and Neurosurgery; UMC Utrecht; Utrecht The Netherlands
3. Department Neurology; University Hospital Tuebingen; Germany
4. Departments of Neurology and Pediatrics; Washington University St. Louis, Missouri, 660 South Euclid, Box 8111; St. Louis Missouri 63110-1093 USA