1. From the Department of Radiology, Hospital Universitari de Girona Doctor Josep Trueta, Av França S/N, 17007, Girona, Spain (A.R.A., N.C., S.J., A.H., V.P.); Department of Radiology, Hospital Clinic de Barcelona, Barcelona, Spain (B.D.X.); Department of Cardiology, Clinica Colon, Buenos Aires, Argentina (L.R.E.); and Division of Cardiothoracic Imaging, Department of Radiology, University of Colorado Anschutz Medical Campus, Aurora, Colo (D.V.).