1. Latner Thoracic Surgery Research Laboratories, Toronto General Hospital Research Institute, University Health Network, Toronto, Ontario M5G 1L7, Canada.
2. Department of Surgery and Clinical Science, Division of Chest Surgery, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi 755-8505, Japan.
3. Division of Thoracic Surgery, Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario M5G 2C4, Canada.
4. Department of Radiation Oncology, Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario M5G 2C1, Canada.
5. Department of Immunology, University of Toronto, Toronto, Ontario M5S 1A8, Canada.