1. Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Germany
2. Inst. of Neuroscience and Medicine (INM-3, −4), Research Center Juelich, Germany
3. Center for Integrated Oncology (CIO), Universities of Aachen, Bonn, Germany
4. Department of Nuclear Medicine, University Hospital RWTH Aachen, Germany
5. Department of Stereotaxy and Functional Neurosurgery, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany