1. From the Division of Neurocritical Care and Emergency Neurology, Department of Neurology, Center for Neurotechnology and Neurorecovery, Massachusetts General Hospital, Boston (D.J.L.)
2. Stroke Service, Department of Neurology, Massachusetts General Hospital, Boston (S.P.F.)
3. Department of Neurology, University of California, Irvine (S.C.C.).