1. Section of Emergency Medicine University of Chicago Chicago Illinois USA
2. Department of Emergency Medicine St. Joseph Mercy Ann Arbor Hospital University of Michigan Medical School Ann Arbor Michigan USA
3. Department of Emergency Medicine Hennepin County Medical Center Minneapolis Minnesota USA
4. Department of Emergency Medicine University of Washington Seattle Washington USA
5. Department of Emergency Medicine UT Southwestern Medical Center Dallas Texas USA
6. Department of Emergency Medicine George Washington University Washington District of Columbia USA
7. Department of Emergency Medicine Massachusetts General Hospital, Harvard Medical School Boston Massachusetts USA
8. Department of Emergency Medicine Indiana University Indianapolis Indiana USA