From the Division of Cardiac Surgery (S.V., C.-H.W., S.-H.L., P.W.M.F., M.V.B., B.D., R.D.W., R.-K.L., D.A.G.M.), Toronto General Hospital, University of Toronto, Toronto, Canada; Division of Neurosurgery (A.S.D), University of Virginia, Charlottesville; and the Division of Cardiology (D.J.S.), St Michael’s Hospital, University of Toronto, Toronto, Canada. (At 2002-08-20)