1 Division of Neurocritical Care, Department of Anesthesiology and Critical Care Medicine, Johns Hopkins Hospital, Baltimore, MD, USA; School of Nursing, University of Virginia, Charlottesville, VA, USA.
2 Mischer Neuroscience Associates, Memorial Hermann Health System, Houston, TX, USA.
3 Division of General Internal Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA, USA.
4 Division of Brain Injury Outcomes, Johns Hopkins University School of Medicine, 750 East Pratt Street, 16th Floor, Baltimore, MD 21202, USA. Electronic address: dhanley@jhmi.edu.