[1] Univ Aquila, Dept Biotechnol & Appl Clin Sci, Laquila, Italy
[2] Univ Tartu, Headache Clin, Tartu, Estonia
[3] Azienda Osped Univ Policlin Consorziale Bari, Ctr Cefalee Clin Neurol L Amaducci, Bari, Italy
[4] Univ Catolics Portuguesa, Hosp Luz, Ctr Interdisciplinary Res Hlth, Lisbon, Portugal
[5] Konventhospital Barmherzige Bruder Linz, Dept Neurol & Headache Med Ctr, Linz, Austria
[6] Sapienza Univ Rome, Dept Clin & Mol Med, Rome, Italy
[7] Natl & Kapodistrian Univ Athens, Sch Med, Aeginit Hosp, Neurol Dept 1, Athens, Greece
[8] Univ Autonoma Barcelona, Headache Unit, Barcelona, Spain
[9] Univ Autonoma Barcelona, Res Grp Vall dHebron, Univ Hosp, Barcelona, Spain
[10] Univ Autonoma Barcelona, Inst Res, Barcelona, Spain
[11] Fac Med, Dept Neurol, Mersin Univ, Mersin, Turkiye
[12] Univ Santa Maria, Ctr Hosp Hosp Cuf Tejo 2, Fac Med & Hosp, Lisbon, Portugal
[13] Vilnius Univ, Ctr Neurol, Kardiolitos klinikos Ctr Neurol, Vilnius, Lithuania
[14] Clin Univ Navarra, Madrid, Spain
[15] Cefalee Neurosonol Policlin Univ Campus Biomed, Rome, Italy
[16] Wroclaw Med Univ, Dept Neurol, Wroclaw, Poland