1. From the Department of Cardiology, The Heart Centre, University Hospital Rigshospitalet, Copenhagen (R.S.R., E.J., Y.W., J.J.T., L.S., L.K., P.G., J.K.); Department of Radiology, University Hospital Rigshospitalet, Copenhagen (R.S.R.); Danish Research Centre for Magnetic Resonance, University Hospital Hvidovre, Hvidovre (J.C.N.); and Department of Haematology, Aalborg University Hospital, Aalborg (H.E.J.), Denmark.