[1] Tech Univ Munich, Klin Anasthesiol & Intens Med, Klinikum Rechts Isar, Ismaninger Str 22, D-81675 Munich, Germany
[2] Tech Univ Munich, Klin & Poliklin Neurol, Klinikum Rechts Isar, Munich, Germany
[3] Tech Univ Munich, Abt Neuroradiol, Klinikum Rechts Isar, Munich, Germany
[4] Tech Univ Munich, Inst Allgemeinmed & Versorgungsforsch, Klinikum Rechts Isar, Munich, Germany