1. Department of Neurology; Johns Hopkins University; Baltimore Maryland USA
2. Department of Neurology, RWTH Aachen University Hospital; Aachen Germany
3. Institute of Neuropathology; RWTH Aachen University Hospital; Aachen Germany
4. Department of Stereotactic and Functional Neurosurgery; Freiburg University Medical Center; Freiburg Germany
5. Department of Neurology; University of Berne; Inselspital Berne Switzerland
6. Department of Neurosurgery; Medical School Hannover (MHH); Hannover Germany