[1] Migraine & Headache Clin Konigstein, Konigstein, Germany
[2] CHU Lille, Serv Neurochirurg, Pain Clin, Hop Salengro, Lille, France
[3] Vall dHebron Univ Hosp, Dept Neurol, Headache Unit, Barcelona, Spain
[4] Univ Autonoma Barcelona, Headache Res Grp, VHIR, Barcelona, Spain
[5] Hamilton Med Grp, Aberdeen, Scotland
[6] Sapienza Univ Rome, St Andrea Hosp, Dept Clin & Mol Med, Rome, Italy
[7] Novartis Pharmaceut, E Hanover, NJ USA
[8] Novartis Pharma AG, Basel, Switzerland