1 Department of Emergency Medicine & Pediatrics, University of Vermont Medical Center and Children's Hospital, Larner College of Medicine at the University of Vermont, Burlington, Vermont.
2 Department of Pediatrics, Ann & Robert H. Lurie Children's Hospital of Chicago, Northwestern University Feinberg School of Medicine, Chicago, Illinois.
3 Department of Pediatrics and Emergency Medicine, Children's Healthcare of Atlanta, Emory University School of Medicine, Atlanta, Georgia.
4 Section of Pediatric Surgery, CS Mott Children's Hospital, University of Michigan Ann Arbor, Ann Arbor, Michigan.
5 Department of Pediatrics, Children's Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania.
6 Departments of Pediatrics and Emergency Medicine, Harvard Medical School; Division of Emergency Medicine, Boston Children's Hospital, Boston, Massachusetts.
7 Department of Pediatrics, Children's National Hospital, George Washington University, Washington.