1. Department of Family and Community Medicine, Women’s College Hospital, Environmental Health Clinic and University of Toronto, Toronto, Ontario, Canada
2. Department of Statistical Sciences and School of the Environment, University of Toronto, Toronto, Ontario, Canada
3. Divisions of Epidemiology & Occupational and Environmental Health, Dalla Lana School of Public Health, Toronto, Ontario, Canada
4. Division of Hematology and Oncology, The Hospital for Sick Children, Toronto, Ontario, Canada
5. Department of Diagnostic Imaging, Research Institute, The Hospital for Sick Children and Department of Medical Imaging, University of Toronto, Toronto, Ontario, Canada