1. From the Department of Radiology (S.A., M.F., U.H., T.J.B.) and Division of Cardiology (S.A., F.M., B.M., I.J.), Massachusetts General Hospital, Boston; and the Department of Internal Medicine II (Cardiology) (S.A., D.R., K.P., W.G.D.) and Institute of Diagnostic Radiology (U.B., K.A.), University of Erlangen, Germany.