1. Headache Science Center, C. Mondino Foundation, Pavia, Italy
2. Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy
3. Department of Neurology, University Hospital Essen, Essen, Germany
4. Department of Neurology, Mayo Clinic, Phoenix, AZ, USA
5. Jefferson Headache Center, Thomas Jefferson University, Philadelphia, PA, USA
6. Montefiore Headache Center, Department of Neurology and Department of Epidemiology and Population Health, Albert Einstein College of Medicine, New York, NY, USA
7. Danish Headache Center, Department of Neurology, Rigshospitalet Glostrup, Faculty of Health and Medical Sciences, University of Copenhagen, Glostrup, Denmark
8. Dept of Clinical Neurosciences, University of Calgary, Calgary, Alberta, Canada
9. Hotchkiss Brain Institute, Calgary, Alberta, Canada
10. Department of Neurology, Leiden University Medical Center, Leiden, the Netherlands
11. National Institute for Health Research-Wellcome Trust King’s Clinical Research Facility, King’s College Hospital, London, England
12. Headache Research Group, VHIR, Universitat Autònoma de Barcelona, Barcelona Spain
13. Neurology Department, Hospital Vall d’Hebron, Barcelona, Spain
14. Neurological Institute, Taipei Veterans General Hospital and Faculty of Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan