[1] Univ Klinikum Heidelberg, Dept Neurol, Coordinating Ctr SPACE Study, DE-69120 Heidelberg, Germany
[2] Univ Klinikum Heidelberg, Dept Vasc Surg, DE-69120 Heidelberg, Germany
[3] Univ Heidelberg, Klinikum Mannheim, Dept Neurol, Mannheim, Germany
[4] Univ Kiel, Dept Neuroradiol, Kiel, Germany
[5] Tech Univ Munich, Dept Vasc Surg, D-8000 Munich, Germany
[6] Univ Hamburg, Dept Neuroradiol, Hamburg, Germany