1. Department of Neurology; University of Cologne; Cologne Germany
2. Institute of Neuroscience and Medicine (INM-1, INM-3), Research Centre Jülich; Jülich Germany
3. Department of Psychological and Brain Sciences; University of California; Santa Barbara USA
4. Max Planck Institute for Metabolism Research; Cologne Germany
5. Institute of Clinical Neuroscience and Medical Psychology, Heinrich Heine University; Düsseldorf Germany