1. Division of Emergency Medicine, Nemours Children’s Hospital and Sidney Kimmel Medical College of Thomas Jefferson University , Wilmington, Delaware , USA
2. Department of Pediatrics, Children’s Hospital of Philadelphia and University of Pennsylvania , Philadelphia, Pennsylvania , USA
3. Division of Emergency Medicine, Children’s Hospital of Pittsburgh and University of Pittsburgh School of Medicine , Pittsburgh, Pennsylvania , USA
4. Division of Pediatric Emergency Medicine, Rhode Island Hospital and Warren Alpert Medical School of Brown University , Providence, Rhode Island , USA
5. Department of Pediatric Emergency Medicine, Children’s Hospital of Wisconsin and Medical College of Wisconsin , Milwaukee, Wisconsin , USA
6. Department of Emergency Medicine, Children’s Minnesota , Minneapolis, Minnesota , USA
7. Department of Pathology, Massachusetts General Hospital and Harvard Medical School , Boston, Massachusetts , USA
8. Department of Research, Nemours Children’s Hospital , Wilmington, Delaware , USA
9. Division of Emergency Medicine, Boston Children’s Hospital and Harvard Medical School , Boston, Massachusetts , USA