1 Department of Surgery, Section of Thoracic Surgery, University of Calgary, Calgary, Alberta, Canada. Electronic address: colin.schieman@albertahealthservices.ca.
2 Department of Cardiovascular and Thoracic Surgery, Rush University Medical Center, Chicago, Ill.
3 Section of General Thoracic Surgery, Duke University Medical Center, Durham, NC.
4 Department of Surgery, Section of Thoracic Surgery, University of Calgary, Calgary, Alberta, Canada.