1. Department of Emergency Medicine, Harbor-UCLA Medical Center, Torrance, CA, USA
2. The Lundquist Institute, Torrance, CA, USA
3. David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA, USA
4. Los Angeles County EMS Agency, Santa Fe Springs, CA, USA
5. Department of Emergency Medicine, Los Angeles County-USC Medical Center, Los Angeles, CA, USA
6. Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
7. Los Angeles Fire Department, Los Angeles, CA, USA
8. Los Angeles County Fire Department, Los Angeles, CA, USA