1. Division of Emergency Medicine, Department of Pediatrics, the Hospital for Sick Children and the University of Toronto, Toronto, Ontario, Canada
2. Division of Emergency Medicine, Department of Pediatrics, Children’s Hospital of Eastern Ontario and University of Ottawa, Ottawa, Ontario, Canada
3. Department of Diagnostic Imaging, The Hospital for Sick Children and University of Toronto, University of Toronto, Toronto, Ontario, Canada
4. Department of Medical Imaging, Children’s Hospital of Eastern Ontario and University of Ottawa, Ottawa, Ontario, Canada
5. Department of Radiology, University of Saskatchewan and Saskatoon Health Region, Saskatoon, Saskatchewan, Canada
6. Department of Emergency Medicine, Kingston General Hospital and Queen’s University, Kingston, Ontario, Canada
7. Division of Orthopaedic Surgery, Department of Surgery, Children’s Hospital of Eastern Ontario and University of Ottawa, Ottawa, Ontario, Canada
8. Division of Orthopaedic Surgery, Department of Surgery, The Hospital for Sick Children and University of Toronto, Toronto, Ontario, Canada