1. From the Departments of Radiology (T.S., C.P.N., M.H., A.S., C.M., K.S., H.S.) and Cardiology (A.Y., D.S.), University of Bonn, Bonn, Germany; Medtronic Bakken Research Center (V.Z.), Maastricht, Netherlands; Department of Cardiology and Angiology (C.V.), Hospital of the University of Muenster, Muenster, Germany; and Department of Radiology of the University of Pennsylvania School of Medicine (H.L.), Philadelphia, Pa.