1 Department of Neurology, Division of Neurocritical Care, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA. Electronic address: abishar1@jh.edu.
2 Departments of Neurology, Anesthesiology, Critical Care Medicine and Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA. Electronic address: rgeocad1@jhmi.edu.