1. Department of Pediatrics, The Hospital for Sick Children and University of Toronto, Toronto, Ontario, Canada;
2. Child Health Evaluative Sciences, The Hospital for Sick Children, Toronto, Ontario, Canada;
3. Department of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, Ontario, Canada;
4. Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark;
5. Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada;
6. Department of Medicine, St Michael’s Hospital and University of Toronto, Toronto, Ontario, Canada; and
7. Centre for Population Health Sciences, Stanford University, Stanford, California