1. Department of Neuromuscular Diseases UCL Queen Square Institute of Neurology and the National Hospital for Neurology and Neurosurgery London UK
2. Institute of Ophthalmology University College London London UK
3. Moorfields Eye Hospital London UK
4. Section of Ophthalmology King's College London, St Thomas' Hospital Campus London UK
5. Leeds Centre for Ophthalmology, Leeds Teaching Hospitals NHS Trust Leeds UK
6. Department of Ophthalmology, Calderdale and Huddersfield NHS Trust Huddersfield UK