1. From CMR Unit and Cardiovascular Biomedical Research Unit, Royal Brompton Hospital, London, United Kingdom (B.P.H., S.K.P.), National Heart and Lung Institute Imperial College, London, United Kingdom (B.P.H., S.K.P., J.G.F.C.); Robertson Centre for Biostatistics, University of Glasgow, United Kingdom (J.G.F.C.); and Leonard M. Miller School of Medicine, University of Miami, FL (J.J.G.).