1. Division of Cardiac Surgery, Department of Surgery, London Health Sciences Centre, London, Ontario, Canada
2. Department of Surgery, Easton Hospital, Easton, PA, USA
3. Division of Cardiology, Montefiore Medical center, Albert Einstein Medical College, New York, NY, USA
4. Department of Medicine, Icahn School of Medicine at Mount Sinai, Mount Sinai St Luke's and West, NY, USA
5. Department of Cardiac Surgery, University of Michigan Cardiovascular Center, Ann Arbor, MI, USA
6. Division of Cardiothoracic Surgery, Department of Surgery, New York Presbyterian Hospital, Columbia University Medical Center, New York, NY, USA
7. Section of Cardiac and Thoracic Surgery, Department of Surgery, The University of Chicago, Chicago, IL, USA