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