[1] Univ Calgary, Dept Cardiac Sci & Surg, Div Cardiac Surg, Libin Cardiovasc Inst, Calgary, AB, Canada
[2] Univ Toronto, Toronto Gen Hosp, Div Vasc Surg, PMCC,UHN, Toronto, ON M5G 1L7, Canada
[3] Univ Manitoba, St Boniface Hosp, Div Cardiac Surg, Winnipeg, MB, Canada
[4] Univ Calgary, Dept Radiol, Div Intervent Radiol, Calgary, AB, Canada
[5] Univ Calgary, Dept Cardiac Sci, Div Cardiol, Libin Cardiovasc Inst, Calgary, AB, Canada
[6] Univ Penn, Dept Anesthesiol & Crit Care, Perelman Sch Med, Philadelphia, PA 19104 USA
[7] Univ Calgary, Dept Anaesthesiol, Calgary, AB, Canada
[8] Univ Calgary, Dept Radiol, Div Intervent Radiol, Calgary, AB, Canada