From the Department of Diagnostic and Interventional Radiology (C.K.K., K.S., S.S.) and Section of Biostatistics, Department of Diagnostic and Interventional Radiology (H.B.), University of Aachen, RWTH, Pauwelsstr 30, 52074 Aachen, Germany; and Department of Radiology, University of Bonn, Bonn, Germany (C.L., H.H.S.). (At 2017-05)
