1. Department of Emergency Medicine Harbor‐UCLA Medical Center Torrance CA
2. Los Angeles Biomedical Research Institute Torrance CA
3. Schaeffer Center for Health Policy and Economics University of Southern California Los Angeles CA
4. Department of Pediatrics Section of Emergency Medicine Children's Hospital of Colorado Aurora CO
5. Division of Healthcare Quality Promotion Centers for Disease Control and Prevention Atlanta GA
6. Department of Emergency Medicine University of California–Davis SacramentoCA
7. Department of Psychiatry and Behavioral Sciences University of California–Davis SacramentoCA