[1] University of Cologne,Department of Neuroradiology, Medical Faculty and University Hospital
[2] University of Cologne,Center for Neurosurgery, Medical Faculty and University Hospital
[3] LMU University Hospital of Munich,Department of Radiology
[4] LMU University Hospital of Munich,Department of Neuroradiology
[5] University of Cologne,Department of Vascular and Endovascular Surgery, Medical Faculty and University Hospital