1. Department of Neuromuscular Diseases, Institute of Neurology University College London London UK
2. Neurogenetics Laboratory, Institute of Neurology University College London London UK
3. Headache and Facial Pain Group University College London Queen Square Institute of Neurology and National Hospital for Neurology and Neurosurgery London UK
4. Department of Neuroscience Karolinska Institutet Stockholm Sweden
5. Molecular and Clinical Sciences Research Institute St George's, University of London London UK
6. Department of Medical & Molecular Genetics, Faculty of Life Sciences & Medicine King's College London London UK
7. Department of Neurology Leiden University Medical Center Leiden The Netherlands
8. Department of Human Genetics Leiden University Medical Center Leiden The Netherlands
9. Neurology Department Royal United Hospital Bath UK
10. Walton Centre Liverpool UK
11. Department of Neurology Hull Royal Infirmary Hull UK
12. Department of Neurology University Hospital North Midlands National Health Service Trust Stoke‐on‐Trent UK
13. Weatherall Institute of Molecular Medicine, University of Oxford Oxford UK
14. Division of Surgery and Interventional Science University College London London UK
15. Science Foundation Ireland FutureNeuro Research Centre, Royal College of Surgeons, Ireland School of Pharmacy and Biomolecular Sciences, Royal College of Surgeons in Ireland Dublin Dublin Ireland
16. Glyfada Headache Clinic Glyfada Greece
17. Department of Neurology Ghent University Hospital Ghent Belgium
18. University College Hospital London London UK
19. Department of Neurology Rouen University Hospital Rouen France
20. Division of Neurology, Department of Clinical Neuroscience Karolinska Institute Stockholm Sweden
21. Department of Research, Innovation, and Education, Division of Clinical Neuroscience Oslo University Hospital Oslo Norway
22. K. G. Jebsen Center for Genetic Epidemiology, Department of Public Health and Nursing, Faculty of Medicine and Health Sciences Norwegian University of Science and Technology Trondheim Norway
23. Department of Neurology Oslo University Hospital Oslo Norway