Claire Bridel1, Valentina Garibotto2. 1. From the Department of Clinical Neurosciences, Division of Neurology (C.B.), and the Department of Radiology, Division of Nuclear Medicine and Molecular Imaging (V.G.), Geneva University and Geneva University Hospitals, Switzerland. 2. From the Department of Clinical Neurosciences, Division of Neurology (C.B.), and the Department of Radiology, Division of Nuclear Medicine and Molecular Imaging (V.G.), Geneva University and Geneva University Hospitals, Switzerland. valentina.garibotto@hcuge.ch.