1. Advocate Christ Medical Center, Department of Emergency Medicine, Oak Lawn, Illinois
2. Cedars-Sinai Medical Center, Department of Emergency Medicine, Los Angeles, California
3. University of California San Francisco, Department of Pediatrics, San Francisco, California
4. University of Chicago, Department of Medicine, Section of Cardiology, Chicago, Illinois
5. University of Chicago, Department of Medicine, Section of Emergency Medicine, Chicago, Illinois
6. University of Chicago, Department of Surgery, Chicago, Illinois
7. Harvard University, Massachusetts General Hospital, Department of Emergency Medicine, Boston, Massachusetts