1. Faculty of Medicine, Memorial University of Newfoundland, St. Johns, NL Canada
2. Division of Cardiac Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA USA
3. Division of Cardiac Surgery, Department of Surgery, Western University, London, ON Canada
4. Department of Surgery, Montreal Heart Institute, Montreal, PQ Canada
5. Division of Cardiac Surgery, Department of Surgery, Memorial University of Newfoundland, St. John's, NL Canada.