1. From the Cardiovascular Magnetic Resonance Unit (A.M.M., S.K.P., J.C.M., D.J.P.) and Department of Pathology (I.H., M.N.S.), Royal Brompton Hospital, London, UK; National Amyloidosis Centre, Royal Free Hospital, London, UK (J.J., P.N.H.); Istituto di Cardiologia, Hospital Sant Orsola, Bologna, Italy (E.P.); and Department of Cardiac Medicine, NHLI, Imperial College, London, UK (P.A.P.-W.).