1. Department of Pediatrics, The Children’s Hospital of Philadelphia, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania;
2. Children’s Hospital Association, Overland Park, Kansas;
3. Department of Pediatrics, Children’s Mercy Hospitals and Clinics, University of Missouri-Kansas City School of Medicine, Kansas City, Missouri;
4. Department of Family and Community Medicine, University of California, San Francisco, San Francisco, California;
5. Department of Emergency Medicine; Child Health Evaluation and Research Unit, Division of General Pediatrics; C.S. Mott Children's Hospital, University of Michigan Medical School, Ann Arbor, Michigan;fDepartment of Pediatrics, Lurie Children's Hospital of Chicago, Northwestern University Feinberg School of Medicine, Chicago, Illinois;
6. Children’s Medical Center of Dallas, University of Texas Southwestern Medical Center, Dallas, Texas;
7. Children’s Hospital Colorado, Aurora, Colorado;
8. Pediatrics, Emory University School of Medicine, Atlanta, Georgia; and
9. Department of Pediatrics, Cincinnati Children’s Hospital and Medical Center, University of Cincinnati School of Medicine, Cincinnati, Ohio