1. From the Multi-Disciplinary Laboratory for the Research of Sight Threatening Diabetic Retinopathy and the2Department of Ophthalmology, University of Toronto, Toronto, Ontario, Canada; and the
2. From the Multi-Disciplinary Laboratory for the Research of Sight Threatening Diabetic Retinopathy and the2Department of Ophthalmology, University of Toronto, Toronto, Ontario, Canada; and the3School of Optometry, University of Waterloo, Waterloo, Ontario,