By David Steward, MB, BS, FRCPC, Professor, Department of Anesthesiology, University of Southern California School of Medicine; Director, Department of Anesthesiology, Children's Hospital of Los Angeles, Los Angeles, CA; and Jerrold Lerman, MD, Professor, Department of Anaesthesia, University of Toronto Faculty of Medicine, Department of Anaesthesia, Hospital for Sick Children, Toronto, Ontario, Canada |