The authors reply

Andrew H Smith¹, Vijay Anand, Mousumi Banerjee+9

• ¹Divisions of Cardiology and Critical Care Medicine, Department of Pediatrics, Vanderbilt University School of Medicine, Monroe Carell Jr Children's Hospital at Vanderbilt, Nashville, TN Department of Critical Care, Stollery Children's Hospital, University of Alberta, Edmonton, AB, Canada Department of Biostatistics, School of Public Health & Institute for Healthcare Policy and Innovation, University of Michigan, Ann Arbor, MI Division of Pediatric Cardiology, Department of Pediatrics, C.S. Mott Children's Hospital and University of Michigan Medical School, Ann Arbor, MI Department of Anesthesiology and Critical Care Medicine, Children's Hospital of Philadelphia and Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA Department of Pediatrics, The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, MI Department of Cardiology, Boston Children's Hospital, Boston, MA Division of Pediatric Cardiology, Department of Pediatrics, C.S. Mott Children's Hospital and University of Michigan Medical School, Ann Arbor, MI Division of Pediatric Cardiology, Department of Pediatrics, Stanford University School of Medicine, Palo Alto, CA Division of Critical Care Medicine, Department of Pediatrics, Benioff Children's Hospital, University of California San Francisco, San Francisco, CA Division of Pediatric Cardiology, Department of Pediatrics, C.S. Mott Children's Hospital and University of Michigan Medical School, Ann Arbor, MI.