Arnaud Saj1, Tomas Ros2, Abele Michela2, Patrik Vuilleumier3. 1. Department of Neurology, Geneva University Hospital, Geneva, Switzerland; Department of Neurosciences, Faculty of Medicine, University of Geneva, Geneva, Switzerland. Electronic address: arnaud.saj@unige.ch. 2. Department of Neurology, Geneva University Hospital, Geneva, Switzerland. 3. Department of Neurology, Geneva University Hospital, Geneva, Switzerland; Department of Neurosciences, Faculty of Medicine, University of Geneva, Geneva, Switzerland.