1. Department of Neurology, Faculty of Medicine, University Hospital Cologne, University of Cologne, Kerpener Straße 62, 50924 Cologne, Germany
2. Department of Functional Neurosurgery and Stereotaxy, Faculty of Medicine, University Hospital Cologne, University of Cologne, Kerpener Straße 62, 50924 Cologne, Germany
3. Institute of Neuroscience & Medicine (INM-3), Forschungszentrum Jülich, Leo-Brandt-Straße, 52425 Jülich, Germany