[1] Univ Calif Irvine, Dept Neurol, Irvine, CA 92717 USA
[2] Univ Calif Los Angeles, Sch Publ Hlth, Dept Epidemiol, Los Angeles, CA 90024 USA
[3] Univ Alberta, Sch Publ Hlth, Dept Publ Hlth Sci, Edmonton, AB T6G 2M7, Canada
[4] Univ Alberta, Sch Publ Hlth, Alberta Ctr Injury Control & Res, Edmonton, AB T6G 2M7, Canada
[5] Toronto Western Hosp, Univ Hlth Network Rehabil Solut, Ctr Res Expertise Improved Disabil Outcomes, Toronto, ON M5T 2S8, Canada
[6] Univ Toronto, Dept Publ Hlth Sci, Toronto, ON, Canada
[7] Univ Toronto, Dept Hlth Policy Management & Evaluat, Toronto, ON, Canada
[8] Toronto Western Res Inst, Div Hlth Care & Outcomes Res, Toronto, ON, Canada