[1] Copenhagen University Hospital – Rigshospitalet,Department of Neurology, Danish Headache Center
[2] University of Copenhagen,Department of Clinical Medicine, Faculty of Health and Medical Sciences
[3] Harvard Medical School,Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center
[4] Harvard Medical School,The Headache and Facial Pain Service
[5] Guy’s and St Thomas’ Hospitals NHS Trust,Institute of Psychiatry, Psychology and Neuroscience
[6] King’s College London,Department of Neurology
[7] Mayo Clinic,Department of Brain and Spinal Cord Injury
[8] Copenhagen University Hospital – Rigshospitalet,undefined