1. From the Medical Imaging Center, Department of Radiology, Nuclear Medicine, and Molecular Imaging, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands (R.K., T.C.K., C.R.); and Department of Medical Imaging, Zuyderland Medical Center, Heerlen/Sittard/Geleen, Henri Dunantstraat 5, 6419 PC Heerlen, the Netherlands (R.M.K.).