1. Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
2. Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
3. Child Health Unit, Faculty of Medical Sciences, The University of the West Indies, St Augustine, Trinidad and Tobago
4. Division of Haematology/Oncology, Department of Paediatrics, The Hospital for Sick Children, Toronto, Ontario, Canada
5. Institute of Health Policy, Management and Evaluation, Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada