1. Medical Faculty, University of Cologne, and Department of Neurology, University Hospital Cologne, Cologne, Germany
2. Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Jülich, Jülich, Germany
3. Department of Neurology and Stroke, and Hertie Institute for Clinical Brain Research, Eberhard-Karls-University Tübingen, Tübingen, Germany