1. Department of Surgery; Hôpital Maisonneuve-Rosemont; University of Montreal; Montréal Québec Canada
2. Department of Surgery; Tom Baker Cancer Centre; University of Calgary; Calgary Alberta Canada
3. Department of Anesthesiology; Hôpital Maisonneuve-Rosemont; University of Montreal; Montréal Québec Canada
4. Department of Pathology; Hôpital Maisonneuve-Rosemont; University of Montreal; Montréal Québec Canada