[1] Univ Klinikum Essen, Univ Klin Neurol, D-45147 Essen, Germany
[2] Univ Klinikum Essen, Schlaganfallzentrum, D-45147 Essen, Germany
[3] Alfried Krupp Hosp, Neurol Klin, Essen, Germany
[4] Univ Klinikum Essen, Inst Diagnost & Intervent Radiol & Neuroradiol, D-45147 Essen, Germany
[5] Univ Klinikum Essen, Westdeutsch Herzzentrum, Kardiol Klin, D-45147 Essen, Germany