1. University of California, San Francisco, Department of Emergency Medicine, San Francisco, California
2. University of Arizona, Department of Emergency Medicine, Tucson, Arizona
3. Alameda Health System, Highland Hospital, Department of Emergency Medicine, Oakland, California
4. Hawaii Emergency Physicians Associated, Kailua, Hawaii
5. Kaiser Permanente San Diego, Department of Emergency Medicine, San Diego, California
6. County of San Diego Health & Human Services Agency, EMS, University of California, Irvine, Department of Emergency Medicine, Orange, California
7. Harbor-UCLA Medical Center, Department of Emergency Medicine, Los Angeles County EMS Agency, Santa Fe Springs, California
8. Santa Barbara EMS agency, Santa Barbara, California
9. Northern California EMS Agency, Redding, California
10. Stanford University, Department of Emergency Medicine, Palo Alto, California