1. Department of Ophthalmology, Royal Hallamshire Hospital, Sheffield, UK
2. The University of Sheffield, Sheffield, UK
3. Department of neuro-ophthalmology, Manchester Royal Eye Hospital, Manchester, UK
4. Newcastle Eye Centre, The Royal Victoria Infirmary, Newcastle Upon Tyne, UK
5. Augenklinik Wettingen, Wettingen, Switzerland
6. University Hospital, Zürich, Switzerland
7. Newcastle University, Newcastle Upon Tyne, UK
8. Department of Neurology, Royal Hallamshire Hospital, Sheffield, UK