1. From the The Heart Hospital (S.M.B., D.M.S., A.S.F., V.M., A.T.C., M.F., J.C.M.); The National Amyloidosis Centre, Royal Free Hospital (S.M.B., S.D.J.G., J.H.P., M.F., C.J.W., A.D.W., P.N.H.); and Institute of Cardiovascular Science, University College London, (S.M.B., D.M.S., J.C.M.) London, United Kingdom.