1. Duke University, Division of Emergency Medicine, Durham, North Carolina
2. Northwestern University, Feinberg School of Medicine, Department of Emergency Medicine, Chicago, Illinois
3. The Ohio State University Wexner Medical Center, Department of Emergency Medicine, Columbus, Ohio
4. University of Illinois College of Medicine at Peoria/OSF Healthcare, Department of Emergency Medicine, Peoria, Illinois
5. Indiana University School of Medicine, Department of Emergency Medicine, Indianapolis, Indiana
6. Washington University in Saint Louis School of Medicine, Department of Emergency Medicine, St. Louis, Missouri
7. Denver Health Medical Center, Department of Emergency Medicine, Denver, Colorado
8. Rush Medical Center, Department of Emergency medicine, Chicago, Illinois