Department of Neurology and Neurophysiology, San Raffaele Scientific Institute, Milan, Italy. Department of Neuroradiology, San Raffaele Scientific Institute, Milan, Italy. Department of Neurology, Division of Neurosciences, Institute of Experimental Neurology (INSPE), San Raffaele Scientific Institute, via Olgettina 58, 20122, Milan, Italy. Department of Neurology and Neurophysiology, San Raffaele Scientific Institute, Milan, Italy. colombo.bruno@hsr.it. Department of Neurology, Division of Neurosciences, Institute of Experimental Neurology (INSPE), San Raffaele Scientific Institute, via Olgettina 58, 20122, Milan, Italy. colombo.bruno@hsr.it.