1. British Columbia Cancer Agency–Vancouver, Vancouver, British Columbia, Canada
2. Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
3. Division of Medical Oncology and Hematology, Princess Margaret Cancer Centre, Toronto, Ontario, Canada
4. Department of Medicine, University of Toronto, Toronto, Ontario, Canada
5. The Ottawa Hospital Research Institute, Ontario, Canada
6. Canadian Cancer Trials Group (CCTG), Kingston, Ontario, Canada