1. Princess Margaret Cancer Centre, Department of Medicine, University Health Network, Toronto, ON, Canada
2. Canadian Cancer Trials Group, Department of Medicine, Queens University, Kingston, ON, Canada
3. Princess Margaret Cancer Centre, Department of Biostatistics, University Health Network, Toronto, ON, Canada
4. Department of Medical Oncology, University of British Columbia and British Columbia Cancer Agency, Vancouver, BC, Canada
5. Princess Margaret Cancer Centre, Department of Medical Biophysics, University Health Network, Toronto, ON, Canada
6. Princess Margaret Cancer Centre, Radiation Medicine Program, University Health Network, Toronto, ON, Canada
7. Department of Surgery, Division of Thoracic Surgery, Toronto General Hospital, University Health Network, Toronto, ON, Canada
8. Department of Medicine in the College of Medicine, Division of Hematology and Oncology, University of Florida, Gainesville, FL, USA
9. Department of Epidemiology, Dalla Lana School of Pubic Health, Toronto, ON, Canada