1Ophthalmology and Vision Sciences at the University of Toronto, Toronto, Canada
2Department of Ophthalmology, Toronto Western Hospital, University Health Network, Toronto, Canada
3The Institute for Clinical Evaluative Sciences, Toronto, Canada
4Department of Ophthalmology, St.Michael's Hospital, Toronto, Canada.
5Health Policy Management and Evaluation at the University of Toronto, Toronto, Canada
6Department of Medicine and Keenan Research Centre in the Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, Canada
7Department of Medicine at the University of Toronto, Toronto, Canada