1. From the Department of Diagnostic and Interventional Radiology (C.K.K., R.B., N.K., S.N., S.S.) and Department of Urology (A.H.), University of Aachen, RWTH, Pauwelsstr. 30, Aachen 52074, Germany; and Department of Urology, Uro-oncology, Robot-assisted and Special Urological Surgery, University of Cologne, Cologne, Germany (A.H.).