1 From the American Academy of Neurology (P.K.B., K.M.P., S.L.Q., A.R.), Minneapolis, MN; Department of Radiology and Nuclear Medicine (F.B.), VU University Medical Centre, Amsterdam, the Netherlands; Queen Square Institute of Neurology and Centre for Medical Image Computing (F.B.), University College London, United Kingdom; Larner College of Medicine (R.B.), University of Vermont, Burlington, VT; Department of Neurology (B.C.C.), Veterans Affairs Ann Arbor Health System, MI; Department of Neuroinflammation (O.C.), Institute of Neurology, University College London, United Kingdom; Department of Neurology (P.H.), University of Louisville, KY; University of Oklahoma Health Sciences Center (L.A.H.), Oklahoma City; Dartmouth-Hitchcock Epilepsy Center and Department of Neurology (B.C.J.), Dartmouth-Hitchcock Medical Center, Lebanon, NH; Department of Neurology (A.L.S.), Division of Neurocritical Care Department of Biostatistics, Epidemiology, and Informatics, University of Pennsylvania Perelman School of Medicine, Philadelphia; Department of Neurology (B.B.W.), University of Virginia, Charlottesville; Neurology and Neurological Sciences (C.J.W.), Pediatrics Neonatal Medicine, Neurocritical Care Neurology, Lucile Packard Children's Hospital Neuro NICU, Division of Child Neurology, Stanford, CA; and Department of Neurology (J.G.M.), Georgetown University School of Medicine, MedStar Georgetown University Hospital, Washington, DC.