1. From the College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
2. Section of Cardiac Surgery, St. Boniface Hospital, University of Manitoba, Winnipeg, Manitoba, Canada
3. Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
4. Department of Cardiothoracic Surgery, University of Pittsburgh, Pittsburgh, PA
5. UPMC Heart and Vascular Institute, Pittsburgh, PA
6. Medical Sciences Division, University of Oxford, Oxford, UK; and
7. Section of Cardiac Surgery, Department of Cardiac Sciences, Libin Cardiovascular Institute, University of Calgary, Calgary, Canada.