From the Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, University of Zurich, Raemistr 100, CH-8091 Zurich, Switzerland (R.H., M.E., T.P., B.K., H.A.); Siemens Healthcare, Forchheim, Germany (R.G., B.S., T.G.F.); Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, Switzerland (K.R.); and Department of Cardiovascular Surgery, University Hospital of Zurich, Zurich, Switzerland (M.L.).