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1 Division of Emergency Medicine, Boston Children's Hospital, Boston, Mass. Electronic address: kenneth.michelson@childrens.harvard.edu.
2 Division of Emergency Medicine, Cincinnati Children's Hospital and the Department of Pediatrics University of Cincinnati College of Medicine, Cincinnati, Ohio.
3 Pediatric Emergency Medicine, Medical College of Wisconsin, Milwaukee, Wis.
4 Division of Emergency Medicine, Boston Children's Hospital, Boston, Mass.
1 Division of Emergency Medicine, Boston Children's Hospital, Boston, Mass. Electronic address: kenneth.michelson@childrens.harvard.edu.
2 Division of Emergency Medicine, Cincinnati Children's Hospital and the Department of Pediatrics University of Cincinnati College of Medicine, Cincinnati, Ohio.
3 Pediatric Emergency Medicine, Medical College of Wisconsin, Milwaukee, Wis.
4 Division of Emergency Medicine, Boston Children's Hospital, Boston, Mass.