Affiliation: | 1. Division of Pediatric Emergency Medicine, Children's Hospital of Philadelphia, , Philadelphia, PA;2. Perelman School of Medicine, University of Pennsylvania, , Philadelphia, PA;3. Department of Emergency Medicine, , Milwaukee, WI;4. Medical College of Wisconsin, , Milwaukee, WI;5. Department of Emergency Medicine, Beth Israel Deaconess Hospital, , Boston, MA;6. Department of Emergency Medicine, Albert Einstein Health System, , Philadelphia, PA;7. Departments of Emergency Medicine & Epidemiology, University of Pennsylvania, , Philadelphia, PA |