1. From the Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Raemistrasse 100, 8091 Zurich, Switzerland (M.E., R.H., A.L.N.S., A.E., R.M., H.A.); Department of Cardiology, University Heart Center Zurich (N.K., B.E.S., A.M.K., R.M., F.C.T.), and Epidemiology, Biostatistics and Prevention Institute (K.R.), University of Zurich, Zurich, Switzerland; and Institute for Biomedical Engineering, Swiss Federal Institute of Technology in Zurich (ETH), Zurich, Switzerland (R.M.).