1. Department of Emergency Medicine, University of California, San Francisco, San Francisco
2. Department of Emergency Medicine, Duke University, Durham, NC
3. Henry J.N. Taub Department of Emergency Medicine, Baylor College of Medicine, Houston
4. University of Washington-Harborview Center for Prehospital Emergency Care, Seattle
5. Department of Emergency Medicine, Thomas Jefferson University, Philadelphia
6. Department of Emergency Medicine, University of Washington, Seattle
7. Department of Epidemiology & Biostatistics, University of California, San Francisco, San Francisco