1. Department of Neurology Leiden University Medical Center Leiden The Netherlands
2. Department of Human Genetics Leiden University Medical Center Leiden The Netherlands
3. Department of Research, Innovation and Education, Division of Clinical Neuroscience Oslo University Hospital Oslo Norway
4. 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
5. Department of Neurology Oslo University Hospital Oslo Norway
6. Department of Internal Medicine, Section of Gerontology and Geriatrics Leiden University Medical Center Leiden The Netherlands
7. Institute of Clinical Medicine, Faculty of Medicine University of Oslo Oslo Norway
8. Department of Neurology Danish Headache Center, Rigshospitalet Glostrup Denmark
9. Department of Neuromedicine and Movement Science Norwegian University of Science and Technology Trondheim Norway
10. National Advisory Unit on Headaches, Department of Neurology and Clinical Neurophysiology St. Olav's Hospital Trondheim Norway
11. Department of Clinical Epidemiology Leiden University Medical Center Leiden The Netherlands
12. Einthoven Laboratory for Experimental Vascular Medicine Leiden University Medical Center Leiden The Netherlands
13. Department of Internal Medicine, Division of Endocrinology Leiden University Medical Center Leiden The Netherlands
14. Department of Neuromuscular Diseases, Institute of Neurology University College London London UK
15. Neurogenetics Laboratory, Institute of Neurology University College London London UK
16. Headache and Facial Pain Group The National Hospital for Neurology and Neurosurgery London UK
17. Department of Neuroscience Karolinska Institutet Stockholm Sweden
18. Department of Clinical and Molecular Medicine Norwegian University of Science and Technology Trondheim Norway
19. BioCore ‐ Bioinformatics Core Facility Norwegian University of Science and Technology Trondheim Norway
20. Clinic of Laboratory Medicine St. Olavs Hospital Trondheim Norway
21. Department of General Practice, HELSAM University of Oslo Oslo Norway
22. Department of Neurology Akershus University Hospital Lørenskog Norway
23. Headache Research Group, Vall d'Hebron Institute of Research (VHIR) Universitat Autònoma de Barcelona Barcelona Spain
24. España Unidad de Cefalea, Servicio de Neurología Hospital Universitari Vall d'Hebron Barcelona Spain