1. Division of Ophthalmology, University of Calgary, Calgary, Alberta, Canada
2. Department of Ophthalmology, Hospital Universitario Dr. José E. González, Monterrey, México
3. Department of Ophthalmology, St. Michael's Hospital, University of Toronto, Toronto, Ontario, Canada
4. Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Ontario, Canada
5. Toronto Retina Institute, North York, Ontario, Canada