[1] Hospital Clínico Universitario Valladolid,Headache Unit Neurology Department
[2] University of Copenhagen,Danish Headache Centre and Department of Neurology
[3] Tehran University of Medical Sciences,Headache Department, Iranian Center of Neurological Research Neuroscience Institute
[4] University of Palermo,Child Neuropsychiatry School
[5] U.O. Neuropsychiatry - ARNAS Civico,Neurology Department
[6] University Hospital of Brussels,Internal Medicine Department
[7] Headache Center,Regional Referral Headache Centre, Sant’Andrea Hospital, Department of Clinical and Molecular Medicine
[8] Bambino Gesù Children Hospital IRCCS,Headache Centre, Careggi University Hospital
[9] Pavlov First Saint Petersburg State Medical University,Danish Headache Center, Department of Neurology, Rigshospitalet
[10] Almazov National Medical Research Centre,Glostrup
[11] Sant’Andrea Hospital,Department of Clinical Physiology and Nuclear Medicine, Center for Functional and Diagnostic Imaging
[12] Sapienza University,undefined
[13] University of Florence,undefined
[14] University of Copenhagen,undefined
[15] Hvidovre Hospital,undefined