1 Division of Cardiovascular Surgery, The Labatt Family Heart Centre, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada. Electronic address: alvise.guariento@sickkids.ca.
2 Department of Surgery, Columbia University Medical Center, New York, NY.
3 Paediatric and Congenital Cardiac Surgery Unit, Department of Cardiac, Thoracic and Vascular Sciences, University of Padua, Padua, Italy.