[1] Ludwig Maximilians Univ Munchen, Dept Neurol, Munich, Germany
[2] Med Univ Innsbruck, Dept Neurol, Innsbruck, Austria
[3] Headache Ctr Frankfurt, Frankfurt, Germany
[4] Teva GmbH, Tel Aviv, Israel
[5] St Georg Hosp, Dept Neurol, Leipzig, Germany
[6] Inst Dr Schauerte, Munich, Germany
[7] Charite Univ Med Berlin, Dept Neurol, Berlin, Germany