1 Department of Emergency Medicine, Northwestern Feinberg School of Medicine, Chicago, IL; Center for Healthcare Studies, Northwestern Feinberg School of Medicine, Chicago, IL; Chicago EMS/Illinois Region XI EMS System, Chicago, IL.
2 Department of Emergency Medicine, Northwestern Feinberg School of Medicine, Chicago, IL; Center for Healthcare Studies, Northwestern Feinberg School of Medicine, Chicago, IL.
3 Department of Neurology, Northwestern Feinberg School of Medicine, Chicago, IL; Center for Healthcare Studies, Northwestern Feinberg School of Medicine, Chicago, IL.