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1 Children's National Medical Center, Division of Emergency Medicine, George Washington University School of Medicine and Health Sciences, Washington, DC.
2 New York Presbyterian Morgan Stanley Children's Hospital of New York, New York, New York3Columbia University College of Physicians and Surgeons, New York, New York.
3 Section of Emergency Medicine, Alberta Children's Hospital, Calgary, Canada5University of Calgary, Calgary, Alberta, Canada.
1 Children's National Medical Center, Division of Emergency Medicine, George Washington University School of Medicine and Health Sciences, Washington, DC.
2 New York Presbyterian Morgan Stanley Children's Hospital of New York, New York, New York3Columbia University College of Physicians and Surgeons, New York, New York.
3 Section of Emergency Medicine, Alberta Children's Hospital, Calgary, Canada5University of Calgary, Calgary, Alberta, Canada.