1. From the Department of Cardiovascular Medicine (T.J.G., K.M.C.), University of Oxford, John Radcliffe Hospital, United Kingdom; Departments of Medicine, Cardiovascular Surgery, and Transplantology and Pharmacology (T.J.G., J.S., B.G., A.J., B.K., P.P., K.W., R.K.), Jagiellonian University School of Medicine, Krakow, Poland; and the Division of Cardiology (D.G.H., T.J.G.), Emory University, Atlanta, Ga.