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. Department of Medical and Surgical Sciences and Advanced Technologies “G. Ingrassia,” Section of Anatomic Pathology; University of Catania; Catania Italy
3. National Centre for Rare Diseases; Istituto Superiore di Sanità; Rome Italy