1 Department of Emergency Medicine (Perry, Yadav, Syed), University of Ottawa; School of Epidemiology, Public Health and Preventative Medicine (Perry, Yadav, Shamy), University of Ottawa; Ottawa Hospital Research Institute (Perry, Yadav, Shamy); Division of Neurology (Shamy), Department of Medicine, University of Ottawa, Ottawa, Ont. jperry@ohri.ca.
2 Department of Emergency Medicine (Perry, Yadav, Syed), University of Ottawa; School of Epidemiology, Public Health and Preventative Medicine (Perry, Yadav, Shamy), University of Ottawa; Ottawa Hospital Research Institute (Perry, Yadav, Shamy); Division of Neurology (Shamy), Department of Medicine, University of Ottawa, Ottawa, Ont.