aDivision of Cardiac Surgery, Department of Surgery, University of Toronto, Toronto

bDivision of Cardiac Surgery, Department of Surgery, Western University, London Health Sciences Centre, London, Ontario, Canada

cDepartment of Cardiovascular Surgery, Mount Sinai Hospital, Icahn School of Medicine at Mount Sinai, New York, New York, USA

dDivision of Cardiac Surgery, St. Michael's Hospital, University of Toronto, Toronto, Ontario, Canada

Correspondence to Mark D. Peterson, MD, PhD, FRCSC Associate Professor, Division of Cardiac Surgery, Department of Surgery, University of Toronto, St. Michael's Hospital, 30 Bond Street, 8th Floor, Bond Wing Toronto, Ontario, Canada M5B 1W8. Tel: +1 416 864 3086; fax: +1 416 864 6096; e-mail: [email protected]