1. Department of Neurology, Cliniques Universitaires Saint‐Luc Université Catholique de Louvain Brussels Belgium
2. Department of Neurology, Hôpital Erasme Université Libre de Bruxelles Brussels Belgium
3. Service of Neurology, Department of Clinical Neurosciences Lausanne University Hospital and University of Lausanne Lausanne Switzerland
4. Division of Neuroimmunology and Neurovirology, National Institute of Neurological Disorders and Stroke (NINDS) National Institutes of Health (NIH) Bethesda MD
5. Department of Neurology Cedars‐Sinai Medical Center Los Angeles CA
6. Departments of Neurology and Neurophysiology and Neuroimaging Research Unit Ospedale San Raffaele and Università Vita e Salute Milan Italy
7. Department of Neuroradiology Ospedale San Raffaele and Università Vita e Salute Milan Italy
8. Clinical Trials Unit, National Institute of Neurological Disorders and Stroke (NINDS) National Institutes of Health (NIH) Bethesda MD
9. Department of Neurology Johns Hopkins University Baltimore MD