1. Department of Ophthalmology, St Michael’s Hospital Health Centre, University of Toronto, Toronto, Ontario, Canada
2. Applied Health Research Centre, Li Ka Shing Knowledge Institute, St Michael’s Hospital, Toronto, Ontario, Canada3Institute of Health Policy Management and Evaluation, University of Toronto, Toronto, Ontario, Canada
3. Centre for Research on Inner City Health, Li Ka Shing Knowledge Institute, St Michael’s Hospital, Toronto, Ontario, Canada5Division of General Internal Medicine, Department of Medicine, University of Toronto, Toronto, Ontario, Canada