1. From the Divisions of Neurology (J.W., D.D., G.S., M.S.) and Emergency Medicine (J.P., I.S., J.S., C.S.), Ottawa Hospital, University of Ottawa, Ottawa, Ontario, Canada; Ottawa Hospital Research Institute (J.W., J.P., D.D., G.S., I.S., J.S., C.S., M.S.), University of Ottawa, Ottawa, Ontario, Canada.