1. aDepartment of Pediatrics, University of North Carolina School of Medicine, Chapel Hill, North Carolina
2. bDepartment of Pediatrics, Texas Children’s Hospital and Baylor College of Medicine, Houston, Texas
3. cDepartment of Pediatrics, Children’s Hospital of Philadelphia, University of Pennsylvania, Philadelphia, Pennsylvania
4. dDivision of Pediatric Emergency Medicine, University of Utah, Salt Lake City, Utah
5. eDepartment of Pediatrics, Seattle Children’s Hospital and University of Washington, Seattle, Washington
6. fDepartment of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio
7. gDivision of Emergency Medicine, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio