1. From the Department of Diagnostic and Interventional Radiology, University Medical Center of the Johannes Gutenberg-University, Langenbeckstr. 1, 55131 Mainz, Germany (T.E.); Department of Radiology and Radiological Science, Division of Cardiovascular Imaging, Medical University of South Carolina, Charleston, SC (T.E., A.V.S.); and German Centre for Cardiovascular Research, Mainz, Germany (T.E.).