1. Department of Ophthalmology and Vision Sciences, The Hospital for Sick Children and University of Toronto, Toronto, Canada
2. University of Toronto, Institute of Medical Sciences, Toronto, Canada
3. MAP Centre for Urban Health Solutions, Li Ka Shing Knowledge Institute, St Michael's Hospital, Toronto, Canada
4. Division of General Internal Medicine, Department of Medicine, University of Toronto, Toronto, Canada
5. Department of Ophthalmology & Vision Sciences, Faculty of Medicine & Division of Clinical Public Health, Dalla Lana School of Public Health, University of Toronto, Toronto, Canada