1. Division of Haematology/Oncology, Department of Paediatrics, The Hospital for Sick Children, Toronto, ON, Canada.
2. Child Health Evaluative Sciences, Peter Gilgan Centre for Research and Learning, The Hospital for Sick Children, Toronto, ON, Canada.
3. Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, ON, Canada.
4. Department of Health Research Methods, Evidence and Impact, Centre for Health Economics and Policy Analysis, McMaster University, Hamilton, ON, Canada.