Affiliation: | From the Division of Thoracic Surgery, University of Calgary, Calgary, Alta. (Edwards, Grondin); the Division of General Surgery, University of Calgary, Calgary, Alta. (Bressan, Dharampal, Datta, Dixon, Butte, Ball); the Division of General Surgery, University of Toronto, Toronto, Ont. (Cleary); and the Division of General Surgery, McGill University, Montréal, Que. (Barkun). |