1. Cancer Care Centre, St George Hospital, Sydney, Australia
2. School of Medicine, University of New South Wales, Sydney, Australia
3. National Health and Medical Research Council Clinical Trials Centre, University of Sydney, Sydney, Australia
4. School of Medicine, University of Notre Dame, Sydney, Australia
5. Department of Statistics, Macquarie University, Sydney, Australia
6. Nelune Comprehensive Cancer Centre, Prince of Wales Hospital, Sydney, Australia