1. From the Division of Cardiology, Departments of Medicine (P.J.C., D.S.O., E.V.K., C.L.D., R.G.S., C.M.O.) and Radiology (C.H.-C., L.M., K.Q.N., B.N., J.H.M.), University of Washington School of Medicine, Seattle, and Centre for Advanced Imaging, University of Queensland, Brisbane, Australia (C.H.-C., W.E.S.).