1. Department of Emergency Medicine and Center for Resuscitation Science, University of Pennsylvania, Philadelphia, PA
2. Department of Biostatistics and Epidemiology, University of Pennsylvania, Philadelphia, PA
3. Department of Medicine, University of Pennsylvania, Philadelphia, PA
4. School of Nursing, University of Pennsylvania, Philadelphia, PA
5. Annenberg School of Communication, University of Pennsylvania, Philadelphia, PA
6. Department of Emergency Medicine, Emory University, Atlanta, GA
7. The Duke Clinical Research Institute, Duke University, Durham, NC
8. Department of Medicine, University of Toronto, Ontario, Canada
9. Department of Emergency Medicine, Medical College of Wisconsin, Milwaukee, WI
10. Department of Emergency Medicine, Oregon Health and Science University, Portland, OR
11. Department of Emergency Medicine, University of Texas Southwestern Medical Center, Dallas, TX
12. Department of Emergency Medicine, University of Pittsburgh, PA
13. Department of Medicine, University of Washington, Seattle, WA
14. Department of Emergency Medicine, University of California San Diego, La Jolla, CA