1. Division of Emergency Medicine, Ann and Robert H. Lurie Children’s Hospital of Chicago & Northwestern University Feinberg School of Medicine , Chicago, Illinois , USA
2. Center for Healthcare Policy and Research, University of California Davis School of Medicine , Sacramento, California , USA
3. Department of Emergency Medicine and Division of Research, Kaiser Permanente Northern California; Department of Emergency Medicine, University of California Davis School of Medicine , Sacramento, California , USA
4. Los Angeles County Emergency Medical Services Agency; Harbor-UCLA Medical Center; The David Geffen School of Medicine at UCLA , Los Angeles, California , USA
5. Department of Pediatrics, Division of Infectious Diseases, University of Washington , Seattle, Washington , USA
6. Pediatric Health Associates , Naperville, Illinois , USA
7. Department of Pediatrics, Section of Emergency Medicine, University of Colorado School of Medicine , Aurora, Colorado , USA
8. Division of Emergency Medicine, Boston Children’s Hospital , Boston, Massachusetts , USA
9. Department of Pediatrics, Division of Infectious Diseases, Baylor College of Medicine, Texas Children’s Hospital , Houston, Texas , USA
10. Division of Infectious Diseases, Ann & Robert H. Lurie Children’s Hospital of Chicago, Northwestern University Feinberg School of Medicine , Chicago, Illinois , USA
11. Department of Emergency Medicine and Vanderbilt Institute for Clinical and Translational Sciences, Vanderbilt University Medical Center , Nashville, Tennessee , USA
12. Division of Hospital Medicine, Cincinnati Children’s Hospital Medical Center; Department of Pediatrics, University of Cincinnati College of Medicine , Cincinnati, Ohio , USA
13. Division of Emergency Medicine, Boston Children’s Hospital, Harvard Medical School , Boston, Massachusetts , USA
14. Division of Community Based General Pediatrics, Ann & Robert H. Lurie Children’s Hospital of Chicago, Northwestern University Feinberg School of Medicine , Chicago, Illinois , USA
15. Divisions of Emergency Medicine and Infectious Diseases, Department of Pediatrics, Texas Children’s Hospital, Baylor College of Medicine , Houston, Texas , USA
16. Division of Emergency Medicine, Cincinnati Children’s Hospital Medical Center and University of Cincinnati College of Medicine , Cincinnati, Ohio , USA
17. Department of Pediatrics, The University of Pennsylvania Perelman School of Medicine; Division of Infectious Diseases, The Children’s Hospital of Philadelphia , Philadelphia, Pennsylvania , USA
18. Departments of Emergency Medicine and Pediatrics, UC Davis School of Medicine , Sacramento, California , USA