1 Cerebrovascular Center, Cleveland Clinic, Cleveland, OH; Departments of Neurosurgery, Neurology, and Critical Care, Mayo Clinic, Jacksonville, FL; Rush University College of Nursing, Chicago, IL; Departments of Neurology, Anesthesiology-Critical Care Medicine, Neurosurgery and Medicine, Johns Hopkins University School of Medicine, Baltimore, MD; The Ohio State University Wexner Medical Center, Cerebrovascular and Neurocritical Care Division, Department of Neurology and Neurosurgery, Columbus, OH; Departments of Anesthesia/Critical Care Medicine, and Neurosurgery, Johns Hopkins University, Baltimore, MD; Department of Neurology, University of California San Francisco, San Francisco, CA.