1. Department of Neurology Johns Hopkins University School of Medicine Baltimore Maryland USA
2. Neurologic Clinic and Policlinic Departments of Medicine, Clinical Research, Biomedicine and Biomedical Engineering University Hospital and University of Basel Basel Switzerland
3. Blizzard Institute, Barts and The London School of Medicine and Dentistry Queen Mary University of London London UK
4. Biogen Cambridge Massachusetts USA
5. Department of Neurology Heinrich Heine Universitat Dusseldorf Germany