1. Danish Headache Center, Department of Neurology, Rigshospitalet Glostrup, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
2. National Institute for Health Research–Wellcome Trust King’s Clinical Research Facility, King’s College London, London, United Kingdom
3. Department of Neurology, UCLA (University of California, Los Angeles)
4. Department of Neurology, Mayo Clinic, Scottsdale, Arizona
5. Geisel School of Medicine at Dartmouth, Dartmouth College, Hanover, New Hampshire
6. Amgen Inc, Thousand Oaks, California