Corresponding Author

Katie M Moynihan

Department of Paediatric Intensive Care, Children's Hospital at Westmead, Sydney, New South Wales, Australia

Department of Cardiology, Boston Children's Hospital, Boston, Massachusetts, United States

Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, United States

Correspondence: Dr Katie M Moynihan, Division of Cardiovascular Critical Care, Department of Cardiology, Boston Children’s Hospital, 300 Longwood Avenue, Boston, MA 02115, USA. Fax: +1 617 730 7548; email: katie.moynihan@cardio.chboston.org