1Neuroimaging Research Unit, San Raffaele Scientific Institute, Vita-Salute San Raffaele University, Milan, Italy, 2Clinical Neurology Department, Faculty of Medicine, Al-Azhar University, Cairo, Egypt, 3Xinapse System Ltd, West Bergholt, Essex, United Kingdom, 4Department of Neurology, San Raffaele Scientific Institute, Vita-Salute San Raffaele University, Milan, Italy, 5Department of Neuroradiology, San Raffaele Scientific Institute, Vita-Salute San Raffaele University, Milan, Italy