1. From Cardiothoracic Surgery (V.J.O., P.B.J.B., J.R.P., P.J.R.B., M.H.Y.) and Cardiac Medicine (S.E.H.), National Heart and Lung Institute at Imperial College School of Medicine, London, UK; Nephrology Laboratory (M.C.M.), Klinikum Essen, Essen, Germany; and Klinik III fur Innere Medizin (O.Z., M.B.), Universitat zu Köln, Germany.