[1] St Michaels Hosp, Injury Prevent Res Off, Dept Surg, Div Neurosurg, 30 Bond St, Toronto, ON M5B 1W8, Canada
[2] Dalhousie Univ, Fac Med, Dept Community Hlth & Epidemiol, Halifax, NS, Canada
[3] Univ Toronto, Family & Community Med, Toronto, ON, Canada
[4] Univ Toronto, Fac Med, Occupat Sci & Occupat Therapy, Toronto, ON, Canada