1. Department of Neuroradiology University Medical Center Hamburg‐Eppendorf Hamburg Germany
2. Department of Radiology Stanford University School of Medicine Stanford California USA
3. Department of Neurology and Neurological Sciences Stanford University School of Medicine Stanford California USA
4. Department of Neuroradiology University Marburg Marburg Germany
5. Department of Neuroradiology University Schleswig Holstein, Campus Lübeck Lübeck Germany
6. Institute of Epidemiology and Medical Biometry University Medical Center Hamburg‐Eppendorf Hamburg Germany