1 Department of Neuroscience, Neurology Unit, S. Maria delle Croci Hospital, AUSL Romagna, Ravenna, Italy.
2 Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, L'Aquila, Italy.
3 Department of Neurology, Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany.
4 Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, IRCCS Policlinico San Martino, University of Genova, Genoa, Italy.
5 Department of Neurology, University of California, San Francisco (UCSF), San Francisco, CA, United States.