1 Division of Medical Oncology, Department of Medicine, University of Toronto, Toronto, Canada.
2 Institute of Cancer Policy, King's College London, London, UK; King's Health Partners Comprehensive Cancer Centre, London, UK.
3 Kingston General Hospital Research Institute, Kingston.
4 Department of Oncology, Queen's University, Kingston, Canada; Department of Public Health Sciences, Queen's University, Kingston, Canada. Electronic address: boothc@kgh.kari.net.