From the Instituto Dante Pazzanese de Cardiologia, São Paulo, Brazil (A.A., M.A.C., M.C., A.S.A., A.G.M.R.S., J.E.S.); Academisch Ziekenhuis Rotterdam Dijkzigt (M.A.C., P.W.S.), Cardialysis BV (W.L.), Institute for Medical Technology Assessment (B.v.H.), and Erasmus University Rotterdam (P.G.H.), Rotterdam, Netherlands; CHU Sart Tilman, Liege, Belgium (V.M.G.L., R.V.L.); Herzzentrum Leipzig, Germany (G.S., F.W.M.); and Klinik für Herzchirurgie, Landeskliniken, Salzburg, Austria (F.U.). (At 2001-07-31)