1. From the Department of Clinical Therapeutics, University of Athens, Alexandra Hospital, Athens, Greece (I.I., J.L., K.V., K.S.); First Department of Cardiology, Onassis Cardiac Surgery Center, Kallithea, Greece (G.A., M.M., D.V.C.); and Imperial College School of Medicine, National Heart and Lung Institute, Cardiology Department, Hammersmith Hospital, London, UK (P.N.).