1. From the Departments of Cardiovascular Medicine (T.J.G., S.M., K.M.C.) and Cardiothoracic Surgery (S.M., D.G., C.R., R.P.), University of Oxford, Oxford, UK, and Departments of Medicine (T.J.G.) and Cardiovascular Surgery and Transplantology (J.S.), Jagiellonian University School of Medicine, Cracow, Poland.