1. Department of Pediatrics and Critical Care Medicine, Section of Pediatric Cardiac Intensive Care, Medical City Children’s Hospital, Dallas, Texas;
2. Departments of Pediatrics,
3. Department of Biostatistics, The University of Pennsylvania, Philadelphia, Pennsylvania;
4. Anesthesiology, Critical Care Medicine, and Pediatrics, and
5. Critical Care Medicine, The Children’s Hospital of Philadelphia and University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania;
6. Department of Critical Care Medicine, Hospital for Sick Children, University of Toronto, Toronto, Canada;
7. Department of Paediatrics and Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Canada; and
8. Departments of Anesthesiology and Critical Care Medicine and of Pediatrics, The Johns Hopkins University School of Medicine, Baltimore, Maryland