1 Division of Thoracic Surgery, Department of Surgery, Toronto General Hospital, University of Toronto, 200 Elizabeth Street, 9N969, Toronto, ON, M5G 2C4, Canada. marcelo.cypel@uhn.ca.
2 Department of Anesthesiology, Leuven University Hospitals, Leuven, Belgium.
3 Division of Thoracic and Cardiovascular Surgery, University of Florida, Gainsville, USA.