[1] Univ Toronto, Fac Med, Dept Ophthalmol & Vis Sci, Toronto, ON, Canada
[2] Univ British Columbia, Fac Med, Vancouver, BC, Canada
[3] Univ Toronto, Fac Med, Dept Radiol, Div Neuroradiol, Toronto, ON, Canada
[4] McMaster Univ, Michael G DeGroote Sch Med, Hamilton, ON, Canada
[5] Univ Toronto, Fac Med, Dept Med, Div Neurol, Toronto, ON, Canada
[6] Kensington Vis & Res Ctr, Toronto, ON, Canada
[7] Univ Toronto, Dept Ophthalmol & Visual Sci, Dept Med, Div Neurol, 801 Eglinton Ave West, Suite 301, Toronto, ON M5N 1E3, Canada