1. Hospital for Sick Children Research Institute, Toronto, Ontario, Canada2Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada3Department of Clinical Epidemiology and Biostatistics, McMaster University, Hami
2. School of Population and Public Health, University of British Columbia, Vancouver, Canada6Faculty of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada7Redwood Outcomes, Vancouver, British Columbia, Canada
3. Hospital for Sick Children Research Institute, Toronto, Ontario, Canada4Department of Anesthesia and Pain Medicine, Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada
4. Faculty of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada
5. Michael G. DeGroote School of Medicine, McMaster University, Hamilton, Ontario, Canada
6. Department of Medicine, University of Toronto, Toronto, Ontario, Canada
7. Department of Pediatrics, University of Alberta, Edmonton, Canada11Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Canada
8. Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, Ontario, Canada12Michael G. DeGroote Institute for Pain Research and Care, McMaster University, Hamilton, Ontario, Canada13Department of Anesthesia, McMaster University,
9. Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, Ontario, Canada7Redwood Outcomes, Vancouver, British Columbia, Canada14Stanford Prevention Research Center, Stanford University School of Medicine, Stanford University,
10. Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, Ontario, Canada
11. Redwood Outcomes, Vancouver, British Columbia, Canada15Department of Public Health and Community Medicine, Tufts University, Boston, Massachusetts
12. Redwood Outcomes, Vancouver, British Columbia, Canada14Stanford Prevention Research Center, Stanford University School of Medicine, Stanford University, Stanford, California