1. aDivision of Emergency Medicine, Boston Children’s Hospital, Boston, Massachusetts
2. bDivision of Emergency Medicine, Children’s National Hospital, Washington, District of Columbia
3. cDivision of Pediatrics and Emergency Medicine, Emory University and Children’s Healthcare of Atlanta, Atlanta, Georgia
4. dDepartments of Epidemiology and Pediatrics, New York Academy of Medicine, Mailman School of Public Health at Columbia University, New York, New York
5. eDivision of General Pediatrics, Oregon Health and Science University, Portland, Oregon