1. From the Department of Radiology (E010) (A.A.T., P.B., R.G., H.P.S., D.B.), Division of Biostatistics (T.H.), and Department of Medical Physics (T.A.K.), German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany; and Department of Urology (M.G., M.H.) and Institute of Pathology (C.S.), University of Heidelberg Medical Center, Heidelberg, Germany.