Affiliation: | 1. Department of Pathology and Laboratory Medicine, Indiana University School of Medicine, Indianapolis, USA;2. Department of Neurology, Mayo Clinic, Rochester, USA;3. Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, USA;4. Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, USA;5. Medical Research Council, Laboratory of Molecular Biology, Cambridge, UK |