1 Division of Thoracic Surgery, University of Ottawa, 501 Smyth Road, Ottawa, Ontario K1H 8L6, Canada. Electronic address: faridshamji@hotmail.com.
2 Thoracic Surgery Unit, Department of Surgery, Maisonneuve-Rosemount Hospital, University of Montreal, 5415 L'Assomption Boulevard, Montreal, Quebec H1T 2M4, Canada. Electronic address: Gilles.d.beauchamp@sympatico.ca.