1 Ivey Eye Institute, University of Western Ontario, London, ON, Canada.
2 Faculty of Medicine, Queen's University, Kingston, ON, Canada.
3 Ottawa Hospital Research Institute, University of Ottawa, Ottawa, ON, Canada.
4 Department of Ophthalmology and Visual Sciences, University of Toronto, Toronto, ON, Canada.
5 Department of Ophthalmology, University of Alberta, Edmonton, AB, Canada.
6 Program for the Assessment of Technology and Health (PATH), and Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, ON, Canada.
7 Department of Epidemiology and Biostatistics, University of Western Ontario, London, ON, Canada.
8 Ivey Eye Institute, University of Western Ontario, London, ON, Canada; Department of Epidemiology and Biostatistics, University of Western Ontario, London, ON, Canada.