From the Division of Cardiac Surgery (S.V., S.-H.L., P.E.S., C.-H.W., M.V.B., D.A.G.M., R.D.W., P.W.M.F.), Toronto General Hospital, University of Toronto, Toronto, Ontario, Canada, and the Division of Cardiology (M.A.K., L.Z., D.J.S., M.J.B.K.), Terrence Donnelly Heart Centre, St Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada. (At 2004-05-04)