1. Department of Radiology and Neuroradiology University Hospital Schleswig‐Holstein Kiel Germany
2. Department of Anaesthesiology and Intensive Care Medicine University Schleswig‐Holstein Kiel Germany
3. Department for Neurosurgery University Hospital Schleswig‐Holstein Kiel Germany
4. Tomographic Imaging Department Philips Research Laboratories Hamburg Germany
5. Department of Radiology and Nuclear Medicine Kantonsspital Winterthur Winterthur Switzerland
6. Department of Diagnostic and Interventional Neuroradiology University Hospital Hamburg‐Eppendorf Hamburg Germany