1 Department of Neurology and Neurosurgery, Division of Neurocritical Care, Emory School of Medicine, Emory University Hospital, 1364 Clifton Road NE, Atlanta, GA, 30322, USA.
2 Department of Radiology, Harvard Medical School, Brigham and Women's Hospital, 75 Francis Street, Boston, MA, 02115, USA.
3 Department of Neurology, Harvard Medical School, Brigham and Women's Hospital, 75 Francis Street, Boston, MA, 02115, USA.
4 Department of Neurology, Harvard Medical School, Brigham and Women's Hospital, 75 Francis Street, Boston, MA, 02115, USA. hvait@bwh.harvard.edu.