1 Health Science Interdisciplinary Centre, Sant'Anna School of Advanced Studies, Pisa, and Neurology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Italy. lorenzo.fontanelli@santannapisa.it.
2 Neurology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Italy.
3 Neurology Unit, Neuromotor & Rehabilitation Department, Azienda USL-IRCCS di Reggio Emilia, Italy.