1. Hennepin County Medical Center, Department of Emergency Medicine, Minneapolis, Minnesota University of Minnesota School of Medicine, Department of Emergency Medicine, Minneapolis, Minnesota
2. Hennepin County Medical Center, Department of Emergency Medicine, Minneapolis, Minnesota
3. University of Minnesota School of Medicine, Department of Emergency Medicine, Minneapolis, Minnesota
4. Mercy Medical Center-North Iowa, Department of Emergency Medicine, Mason City, Iowa
5. Aventura Hospital and Medical Center, Department of Emergency Medicine, Miami, Florida