1. Department of Neurology, University of Chicago Pritzker School of Medicine, Chicago, Illinois
2. Department of Preventive Medicine (Biostatistics), Northwestern University Feinberg School of Medicine, Chicago, Illinois
3. Section of Emergency Medicine, University of Chicago Pritzker School of Medicine, Chicago, Illinois
4. Chicago EMS System, Chicago, Illinois
5. Department of Emergency Medicine, University of Cincinnati College of Medicine, Cincinnati, Ohio
6. Department of Emergency Medicine, University of lllinois College of Medicine, Advocate Illinois Masonic Hospital, Chicago, Illinois
7. Department of Emergency Medicine, Cook County Health, Chicago, Illinois
8. American Heart Association, Midwest Region, Chicago, Illinois