1. Department of Anesthesia and Pain Management University Health Network‐Toronto Western Hospital and Women's College Hospital University of Toronto Toronto Ontario Canada
2. Institute of Health Policy Management and Evaluation University of Toronto Toronto Ontario Canada
3. Department of Physical Medicine and Rehabilitation University Health Network‐Toronto Rehabilitation Institute University of Toronto Toronto Ontario Canada
4. Departments of Anesthesiology and Critical Care Medicine & Physical Medicine and Rehabilitation Johns Hopkins School of Medicine Baltimore MD USA
5. Departments of Anesthesiology & Physical Medicine and Rehabilitation Walter Reed National Military Medical Center Bethesda MD USA
6. Research Design and Biostatistics Sunnybrook Health Sciences Centre Toronto Ontario Canada