1. From the Neurocritical Care and Acute Stroke Program, Department of Neurology (A.J.R.), the Section of Neurosurgery, Department of Surgery (A.J.R., K.E.S.), the Department of Health Studies (J.T.), University of Chicago Medical Center, Chicago, Ill; the Division of Neurosurgery, St. Michael’s Hospital, University of Toronto (R.L.M.), and the Keenan Research Center in the Li Ka Shing Knowledge Institute of St. Michael’s Hospital (R.L.M.), Toronto, Ontario, Canada.