1. Department of Emergency Medicine, Hennepin County Medical Center, Minneapolis, Minnesota, United States
2. Department of Emergency Medicine, UCSF—Fresno, Fresno, California, United States
3. Department of Pediatrics, Children's Hospital Colorado, Colorado Springs, Colorado, United States
4. Department of Pediatrics, University of British Columbia, Vancouver, BC, Canada
5. Department of Pediatrics, University of Minnesota, Minneapolis, Minnesota, United States