1. Departments of Neurology and Pediatrics; Johns Hopkins Hospital; Baltimore Maryland U.S.A
2. Division of Child Neuropsychiatry; Department of Brain and Behavioral Sciences; National Neurological Institute C. Mondino; University of Pavia; Pavia Italy
3. Center Saint Paul; Hospital Henri Gastaut; Marseille France
4. Department of Pediatric Neurology; Necker Enfants Malades Hospital; Paris Descartes University; Paris France