1. From the Department of Neurology (A.S.D., E.G., A.B., R.W.R., A.A.F., A.V., L.H.S., J.R., S.M.G., M.E.G.), Massachusetts General Hospital, Department of Neurology (A.S.D.), Beth Israel Deaconess Medical Center, and Henry and Allison McCance Center for Brain Health (A.B., J.R.), Massachusetts General Hospital, Harvard Medical School, Boston; Centre Hospitalier (M.P.), Université de Tours, France; and Department of Emergency Medicine (J.G.), Massachusetts General Hospital, Harvard Medical School, Boston.