[1] Univ Toronto, Div Neurol, Dept Med, Toronto, ON, Canada
[2] Univ Toronto, Sunnybrook Hlth Sci, Div Neurol, Dept Med, Toronto, ON, Canada
[3] Univ Toronto, UHN Toronto Gen Hosp, Div Neurol, Dept Med, Toronto, ON, Canada
[4] Univ Toronto, Dept Obstet & Gynaecol, Sunnybrook Hlth Sci Ctr, Maternal Fetal Med, Toronto, ON, Canada