1. Department of Cardiology, University Heart & Vascular Center Hamburg, University Medical Center Hamburg-Eppendorf , Martinistr. 52, 20251 Hamburg , Germany
2. German Center for Cardiovascular Research (DZHK), Partner Site Hamburg/Kiel/Luebeck , Martinistr 52, 20251 Hamburg , Germany
3. Department of Diagnostic and Interventional Radiology and Nuclear Medicine, University Medical Center Hamburg-Eppendorf , Martinistr 52, 20251 Hamburg , Germany
4. Department of Diagnostic and Interventional Neuroradiology, University Medical Center Hamburg-Eppendorf , Martinistr. 52, 20251 Hamburg , Germany
5. Institute of Cardiovascular Sciences, University of Birmingham , Edgbaston, Birmingham, B15 2TT , UK