1. Neurology Department Aeginition Hospital, Medical School, National and Kapodistrian University of Athens Athens Greece
2. Headache Unit, Neurology Department Hospital Universitari Vall d'Hebron Barcelona Spain
3. Headache and Neurological Pain Research Group, Department of Medicine, Vall d'Hebron Research Institute Universitat Autònoma de Barcelona Barcelona Spain
4. Neurophysiopathology Unit, DiBrain Department Aldo Moro University Bari Italy
5. Athens Naval Hospital Athens Greece
6. Istanbul Faculty of Medicine, Department of Neurology Istanbul University Istanbul Turkey
7. Department of Neurology and Algology, NÖROM Gazi University Ankara Ankara Turkey
8. Department of Neurology University Hospital Schleswig‐Holstein Lübeck Germany
9. Department of Neurology Akershus University Hospital Lørenskog Norway
10. NorHead, Norwegian Centre for Headache Research Akershus University Hospital Lørenskog Norway
11. Department of General Practice, HELSAM University of Oslo Oslo Norway
12. Department of Neurology and Stroke Unit Konventhospital Barmherzige Brüder Linz Linz Austria
13. Headache Medical Center Linz Linz Austria
14. Grenoble Alpes University, Division of Neurology, CHU of Grenoble Grenoble Institute of Neurosciences Grenoble France
15. Centre Hospitalier Universitaire of Grenoble Grenoble France
16. Department of Neurology Landesklinikum Mistelbach‐Gänserndorf Mistelbach Austria
17. Department of Neurology Leiden University Medical Center Leiden The Netherlands
18. Neurology Department Clinica Universidad de Navarra Pamplona Spain