1. Department of Radiology, Clinic of Radiology & Nuclear Medicine, University Hospital of Basel, University of Basel, 4001 Basel, Switzerland
2. Imamed Radiologie Nordwest AG, 4051 Basel, Switzerland
3. Department of Radiology, Gesundheitszentrum Fricktal, 4310 Rheinfelden, Switzerland
4. Department of Neurology, University Hospital of Basel, University of Basel, 4001 Basel, Switzerland
5. Department of Diagnostic and Interventional Neuroradiology, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany
6. Department of Radiology and Neuroradiology, Stadtspital Zürich, 8063 Zürich, Switzerland