1. From the American Society of Echocardiography (S.K., T.J.R., N.J.W.), the American Society of Nuclear Cardiology (M.D.C., V.D., M.S.V.), the North American Society of Cardiac Imaging (J.A.R.), the Society for Cardiac Angiography and Interventions (A.K.J., W.K.L.), and the Society for Cardiovascular Magnetic Resonance (D.J.P).