[1] Univ Ottawa, Ottawa Hlth Res Inst, Ottawa Hosp, Clin Epidemiol Unit,Dept Med & Epidemiol, Ottawa, ON K1Y 4E9, Canada
[2] Univ Ottawa, Ottawa Hlth Res Inst, Ottawa Hosp, Clin Epidemiol Unit,Dept Community Med, Ottawa, ON K1Y 4E9, Canada
[3] Novartis Pharma Canada Inc, Dorval, PQ, Canada
[4] Ctr Movement Disorders, Markham, ON, Canada
[5] Univ Toronto, Div Neurol, Dept Med & Psychiat, Toronto, ON, Canada