3 Paediatric Neurology Research Group, Valld'Hebron Research Institute, Universitat Autònoma de Barcelona, Barcelona, Spain.
4 Laboratory of Medical Genetics, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy.
5 Paediatric Radiology and Neuroradiology Department, COALA (Center for Diagnosis and Treatment of Leukodystrophies)-V. Buzzi Children's Hospital, Milan, Italy.
6 Department of Biomedical and Clinical Sciences, L. Sacco, University of Milan, Milan, Italy.
7 Department of Child Neurology, Hospital Valld'Hebron-Institut de Recerca (VHIR), Barcelona, Spain.
8 CIBERER, Centro de Investigaciones Biomédicas en Red de Enfermedades Raras, Madrid, Spain.
9 Faculty of Medicine, Universitat Autònoma de Barcelona, UnitatDocentValld'Hebrón, Barcelona, Spain.