[1] Hospital Universitari Vall d’Hebron,Headache Unit, Neurology Department
[2] Vall d’Hebron Research Institute (VHIR),Headache Research Group
[3] Universitat Autònoma de Barcelona,Calitè Research Group
[4] Miguel Hernández University,Headache Unit, Neurology Department
[5] Marqués de Valdecilla Hospital,Neurology Department
[6] Valdecilla Biomedical Research Institute (IDIVAL),Headache Unit, Neurology Department
[7] Cádiz University,Neurology Department
[8] University Hospital of Valladolid,Neurology Department
[9] Institute for Biomedical Research of Salamanca (IBSAL),Neurology Department
[10] University Hospital of Getafe,undefined
[11] San Carlos Hospital,undefined
[12] University Hospital of Fuenlabrada,undefined
[13] University Hospital of Albacete,undefined
[14] Virgen de la Arrixaca University Hospital,undefined
[15] Alicante-Sant Joan Health District,undefined
[16] Health Services Research in Chronic Illnesses Network,undefined
[17] REDISSEC,undefined