[1] Hosp Clin San Carlos, Neurol Dept, Madrid, Spain
[2] Hosp Clin Univ Lozano Blesa, Neurol Dept, Zaragoza, Spain
[3] Fdn Jimenez Diaz, Neurol Dept, Madrid, Spain
[4] Eli Lilly, Madrid, Spain
[5] Outcomes 10, Castellon de La Plana, Spain
[6] Jaume I Univ, Dept Med, Ave Sos Baynat S-N, Castellon de La Plana 12071, Spain
[7] Hosp Clin Univ Valladolid, Neurol Dept, Headache Unit, Valladolid, Spain
[8] Univ Valladolid, Dept Med, Valladolid, Spain