1. Department of Paediatric Neurology; Chelsea and Westminster Hospital; London United Kingdom
2. Unit of Genetics and Paediatric Immunology; Department of Paediatrics, University of Messina; Messina Italy
3. Department of Clinical and Experimental Medicine; University of Catania; Catania Italy
4. Great Ormond Street Hospital for Children NHS Foundation Trust; London United Kingdom
5. Unit of Infantile Neuropsychiatry; Department of Paediatrics; University of Messina; Messina Italy
6. Unit of Neuroradiology, Department of Biomedical Sciences and Morpho-Functional Imaging; University of Messina; Messina Italy
7. Unit of Pediatric Cardiology; Department of Paediatrics; University of Messina; Messina Italy
8. Institute of Medical Genetics; “CSS-Mendel” Institute; Rome Italy
9. Bambino Gesù Children's Hospital; IRCCS; Rome Italy
10. Institute of Neurological Sciences; National Research Council; Catania Italy
11. National Centre for Rare Diseases; Istituto Superiore di Sanità; Rome Italy
12. Institute for Physiological Chemistry and Pathobiochemistry; University of Munster; Munster Germany