1 Faculty of Medicine (de Waard, Fagan, Horne), Dalhousie University; Division of Cardiac Surgery (de Waard, Fagan, Horne), QEII Hospital, Halifax, NS; Bethesda Hospital (Minnaar), Steinbach, Man.
2 Faculty of Medicine (de Waard, Fagan, Horne), Dalhousie University; Division of Cardiac Surgery (de Waard, Fagan, Horne), QEII Hospital, Halifax, NS; Bethesda Hospital (Minnaar), Steinbach, Man. David.Horne@iwk.nshealth.ca.