1. From the Department of Pediatrics Northwestern University Feinberg School of Medicine & Division of Pediatric Emergency Medicine Ann and Robert H. Lurie Children’s Hospital of Chicago Chicago ILUSA
2. the Department of Pediatrics University of Cincinnati College of Medicine & Division of Emergency Medicine Cincinnati Children’s Hospital Medical Center Cincinnati OHUSA
3. and the Department of Pediatrics University of Colorado School of Medicine & Section of Emergency Medicine Children's Hospital Colorado Aurora COUSA
4. and the Department of Emergency Medicine University of Cincinnati College of Medicine Cincinnati OHUSA