1. McGovern Medical School at The University of Texas Health Science Center at Houston (UT Health), Department of Emergency Medicine, Houston, Texas
2. University of Chicago Pritzker School of Medicine, Section of Emergency Medicine, Chicago, Illinois Chicago Emergency Medical Services System, Chicago, Illinois
3. Chicago Emergency Medical Services System, Chicago, Illinois John H. Stroger, Jr., Hospital of Cook County, Department of Emergency Medicine, Chicago, Illinois
4. Chicago Emergency Medical Services System, Chicago, Illinois Northwestern University Feinberg School of Medicine, Department of Emergency Medicine, Chicago, Illinois
5. Chicago Emergency Medical Services System, Chicago, Illinois Advocate Illinois Masonic Medical Center, Department of Emergency Medicine, Chicago, Illinois
6. Chicago Emergency Medical Services System, Chicago, Illinois Illinois Department of Public Health, Springfield, Illinois
7. Chicago Emergency Medical Services System, Chicago, Illinois Northwestern University Feinberg School of Medicine, Department of Emergency Medicine, Chicago, Illinois Northwestern Feinberg School of Medicine Center for Healthcare Studies, Institute for Public Health and Medicine, Chicago, Illinois University of Cincinnati School of Medicine, Division of EMS, Department of Emergency Medicine, Cincinnati, Ohio