[1] Univ Hosp LMU Munich, Dept Neurol, Munich, Germany
[2] Innsbruck Med Univ, Dept Neurol, Innsbruck, Austria
[3] Headache Ctr Frankfurt, Frankfurt, Germany
[4] Teva GmbH, Ulm, Germany
[5] Hosp Sankt Georg Leipzig gGmbH, Dept Neurol, Headache Ctr Halle, Leipzig, Germany
[6] Univ Hosp Halle, Dept Neurol, Headache Ctr Halle, Halle, Saale, Germany
[7] Helios Global Hlth, Berlin, Germany
[8] Charite Univ Med Berlin, Dept Neurol, Berlin, Germany