1. Department of Neuro-ophthalmology, Moorfields Eye Hospital, London, UK
2. Department of Neuro-ophthalmology, Mayo Clinic Jacksonville, Jacksonville, FL, USA
3. Department of Neuro-ophthalmology, University of Michigan, Ann Arbor, MI, USA
4. Department of Medicine, Neurology, University Health Network and University of Toronto, Toronto, Canada
5. Institute of Health Policy, Management and Evaluation, Dalla Lana School of Public Health, University of Toronto, Toronto, Canada