1. Neuro-ophthalmology, Queen Elizabeth Hospital, University Hospital Birmingham NHS Foundation Trust, Birmingham, Birmingham, UK
2. Translational Brain Science, Institute of Metabolism and Systems Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
3. Save Sight Institute, University of Sydney, Sydney, NSW, Australia
4. Neuro-ophthalmology Division, John A. Moran Eye Center, University of Utah, Salt Lake City, USA
5. Institut für Medizinische Informatik, Biometrie undEpidemiologie (IMIBE), Medizinische Fakultät der Universität Duisburg-Essen, Essen, Germany
6. The Saul R. Korey Department of Neurology, and the Montefiore Headache Center, Albert Einstein College of Medicine, Bronx, New York, USA
7. Department of Neurosurgery, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark
8. Institute of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
9. Wilmer Eye Institute and Departments of Ophthalmology, Neurology, and Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
10. Headache Unit, Neurology Department, Hospital Universitari Vall d'Hebron, Barcelona, Spain
11. Headache and Neurological Pain Research Group, Vall d'Hebron Research Institute, Department of Medicine, Universitat Autònoma de Barcelona, Barcelona, Spain
12. Headache Department, Iranian Centre of Neurological Research, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, Iran
13. Headache Department, Neurology Ward, Sina Hospital, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
14. Cancer Research Clinical Trials Unit, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
15. Department of Ophthalmology, Weill Cornell Medical College, NY Presbyterian Hospital, New York, New York, USA
16. Department of Neurology, Weill Cornell Medical College, NY Presbyterian Hospital, New York, New York, USA
17. Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong SAR, China
18. Hong Kong Eye Hospital, Hong Kong SAR, China
19. Unit of Translational Neurovascular Research, IRCCS Mondino Foundation, 27100, Pavia, Italy
20. Department of Brain and Behavioural Sciences, University of Pavia, 27100, Pavia, Italy
21. Department of Neurology, University Hospitals Birmingham, Queen Elizabeth Hospital, Birmingham, UK
22. Department of Neurology, Leiden University Medical Center, Leiden, the Netherlands
23. Department of Neurology, Danish Headache Center, Rigshospitalet-Glostrup, University of Copenhagen, Copenhagen, Denmark