1. Department of Neurology, Royal Hallamshire Hospital, Sheffield, UK
2. Expertise Centrum Neuro-ophthalmology, Departments of Neurology & Ophthalmology, Amsterdam Umc, Amsterdam, The Netherlands
3. Department of Neuro-Ophthalmology, Moorfields Eye Hospital, London, UK
4. Department of Neuro-Ophthalmology, The National Hospital For Neurology And Neurosurgery, London, UK
5. Department of Molecular Neurosciences, Ucl Institute of Neurology, London, UK