1 Pediatric Neurology, Pediatric University Department, Azienda Ospedaliera Universitaria Pisana, University of Pisa, Italy.
2 Pediatric Neurology and Muscular Diseases Unit, IRCCS "G. Gaslini" Institute, Genova, Italy; Department of Neurosciences, Rehabilitation, Ophtalmology, Genetics, Maternal and Child Health, University of Genoa, Genova, Italy. Electronic address: [email protected].