2 Department of Neurology, University of Michigan Health System, 1500 East Medical Center Drive, Ann Arbor, MI 48109, USA. Electronic address: kakerber@med.umich.edu.
3 University of Michigan, TC B1-354/5303, 1500 East Medical Center Drive, Ann Arbor, MI 48109, USA. Electronic address: wmeurer@med.umich.edu.
4 The Johns Hopkins University School of Medicine, 1830 East Monument Street, Suite 6-100, Baltimore, MD 21287, USA. Electronic address: romron1@jhmi.edu.
5 Department of Emergency Medicine, Beth Israel Deaconess Medical Center, Administrative Offices, West CC-2, 1 Deaconess Place, Boston, MA 02215, USA. Electronic address: jedlow@bidmc.harvard.edu.