National Cerebral and Cardiovascular Center Research Institute - Department of Preventive Medicine and Epidemiology, University of Michigan at Ann Arbor, University of Michigan at Ann Arbor, University of Michigan at Ann Arbor - Department of Emergency Medicine, University of Michigan at Ann Arbor - Department of Emergency Medicine, University of Michigan at Ann Arbor, University of Michigan at Ann Arbor, Vanderbilt University, University of Michigan at Ann Arbor and University of Michigan at Ann Arbor - Department of Emergency Medicine