1. Department of Emergency Medicine Massachusetts General Hospital Boston Massachusetts USA
2. Departments of Internal Medicine and Pediatrics Massachusetts General Hospital Boston Massachusetts USA
3. Division of Pediatric Emergency Medicine Department of Emergency Medicine Massachusetts General Hospital Boston Massachusetts USA
4. Division of Emergency Medicine Boston Children's Hospital Boston Massachusetts USA
5. Division of Emergency Medicine, Department of Pediatrics, Ann & Robert H. Lurie Children's Hospital Northwestern University Feinberg School of Medicine Chicago Illinois USA
6. Division of Emergency Medicine Department of Pediatrics, Children's Hospital of Philadelphia Perelman School of Medicine at the University of Pennsylvania Philadelphia Pennsylvania USA