From the Departments of Neurology (C.J.B., B.S., D.K.) and Emergency Medicine (R.R.), University of Michigan, Ann Arbor; Department of Biostatistics (H.S.), Cincinnati Children's Hospital Medical Center; Departments of Neurology and Rehabilitation Medicine (D.R., L.N., R.J.S., D.W., S.F., E.A.M., S.D., M.H., M.L.F., B.K.) and Department of Emergency Medicine (K.B.W.), University of Cincinnati, OH; Department of Neurology (A.S.J.), Yale University, New Haven, CT; Miami Neuroscience Institute (F.D.L.R.L.R.), Baptist Health South Florida; Department of Neurology (J.M.), Indiana University School of Medicine, Indianapolis; Department of Neurology (E.C.), University of Chicago, IL; Department of Neurology (S.S.), University of Kansas Medical Center, Kansas City; Department of Neurology (M.S.), Soroka Medical Center, Beersheba, Israel; and National Neurology Program (S.R.M.), Veterans Health Administration and Department of Neurology, Baylor College of Medicine, Houston, TX.