1 Department of Neurology (P.K., M.P., H.-J.H., M.M.), Institute of Neuropathology (C.M.), University Hospital Magdeburg; German Center for Neurodegenerative Diseases (DZNE) Magdeburg (P.K.), Germany; Institute of Neurology (M.B., G.G.K., R.H.), Department of Pediatric and Adolescent Medicine (M.B.), Department of Neurology (P.R.), Division of Neuroradiology and Musculoskeletal Radiology (C.M.), Department of Biomedical Imaging and Image-guided Therapy, and Department of Neuroimmunology (H.L.), Center for Brain Research, Medical University of Vienna, Austria; Department of Neuropathology (I.M., W.B.), University Medical Center Göttingen; Leibniz Institute for Neurobiology (H.-J.H.), Magdeburg; Department of Neurology (M.M.), MEDIAN NRZ Flechtingen, Germany; Clinical Department of Neurology (M.R.), Innsbruck Medical University, Austria; Neuroimmunology (K.-P.W., F.L.), Institute of Clinical Chemistry, University Hospital Schleswig-Holstein, Kiel/Lübeck; Department of Neurology (K.-P.W.), University Hospital Schleswig-Holstein, Lübeck; and Department of Neurology (F.L.), University Hospital Schleswig-Holstein, Kiel, Germany.