1. Departments of Emergency Medicine and Pediatrics; Child Health Evaluation and Research Unit; University of Michigan Medical School; Ann Arbor Michigan
2. Children's Hospital Association; Overland Park Kansas
3. Department of Pediatrics; Ann and Robert H. Lurie Children's Hospital of Chicago; Center for Healthcare Studies; Feinberg School of Medicine; Northwestern University; Chicago Illinois
4. Department of Pediatrics; The Children's Hospital of Philadelphia; Perelman School of Medicine; University of Pennsylvania; Philadelphia Pennsylvania
5. Department of Pediatrics; University of Texas Southwestern Medical Center; Dallas Texas
6. Department of Pediatrics; Cincinnati Children's Hospital and Medical Center; University of Cincinnati School of Medicine; Cincinnati Ohio