1. Rush University Medical Center, Department of Emergency Medicine, Chicago, Illinois
2. University of Iowa Carver College of Medicine, Iowa City, Iowa
3. University of Michigan School of Medicine, Department of Emergency Medicine, Ann Arbor, Michigan
4. Allegheny Health Network, Department of Emergency Medicine, Erie, Pennsylvania
5. The Ohio State University Wexner Medical Center, Department of Emergency Medicine, Columbus, Ohio
6. Yale School of Medicine, Department of Emergency Medicine, New Haven, Connecticut
7. Virginia Commonwealth University School of Medicine, Department of Emergency Medicine, Richmond, Virginia