1. Unit of Rare Diseases of the Nervous System in Childhood, Department of Clinical and Experimental Medicine, Section of Pediatrics and Child Neuropsychiatry, University of Catania, Catania, Italy
2. Instiute of Neurological Science, National Research Council, Catania, Italy
3. Post-graduate School of Pediatrics, Anna Meyer Children's University Hospital, Department of Health Science University of Florence, Florence, Italy
4. Dermatology Clinic, University of Catania, Catania, Italy
5. Unit of Clinical Pediatrics, Department of Clinical and Experimental Medicine, Section of Pediatrics and Child Neuropsychiatry, University of Catania, Catania, Italy
6. Unit of Dermatology, Oasi Research Institute-IRCCS, Troina, Enna, Italy
7. Section of Psychology, Department of Educational Sciences University of Catania, Catania, Italy
8. Department of Medical and Surgical Sciences and Advanced Technology “G.F. Ingrassia,” University of Catania, Catania, Italy
9. Servicio de Neurología, Hospital Universitario La Paz, Madrid, España
10. Maurice Wohl Clinical Neuroscience Institute, King's College London, London, United Kingdom