1. Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
2. Department of Emergency Medicine and Pediatrics, University of California–Los Angeles David Geffen School of Medicine, Los Angeles, CA, USA
3. Department of Emergency Medicine, Harbor-UCLA Medical Center, Torrance, CA, USA
4. Los Angeles Biomedical Research Institute, Torrance, CA, USA
5. Los Angeles County Emergency Medical Services Agency, Santa Fe Springs, CA, USA
6. Division of Pediatric Surgery, Children’s Hospital Los Angeles, CA, USA