1. From the Cardiovascular Research Center (T.G.N., S.L.B., F.I., M.J.R., E.S.B., E.F., A.G., K.D.B.) and Cardiac Ultrasound Laboratory (T.G.N., D.S.J., T.M.P.-S., M.H.P., M.S.-C.) in the Cardiology Division of the Department of Medicine, and Department of Anesthesia and Critical Care (F.I., K.D.B.), Massachusetts General Hospital, Charlestown; and Center for Transgene Technology and Gene Therapy, Flanders Interuniversity Institute for Biotechnology, Cardiology Division, University Hospital...