1 Department of Radiology, German Cancer Research Center (DKFZ), INF 280, Heidelberg, 69120, Germany. a.radbruch@dkfz.de.
2 Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, University Duisburg-Essen, Essen, Germany. a.radbruch@dkfz.de.
3 Departmental Faculty of Medicine and Surgery, Università Campus Bio-Medico di Roma, Rome, Italy.