1. Dutch Expertise Centre for Neuro-ophthalmology and Department of Ophthalmology, Amsterdam UMC, Vrije Universiteit Amsterdam, The Netherlands
2. Amsterdam UMC, Vrije Universiteit Amsterdam, Department of Neurosurgery, De Boelelaan 1117, Amsterdam, The Netherlands
3. Dutch Expertise Centre for Neuro-ophthalmology and Department of Neurology, Amsterdam UMC, Amsterdam, The Netherlands
4. Moorfields Eye Hospital and The National Hospital for Neurology and Neurosurgery, London, UK
5. UCL Queen Square Institute of Neurology, London, UK