1. From the Department of Cardiology, Concord Repatriation General Hospital (R.W.S., L.K.), and the Departments of Cardiology and Cardiothoracic Surgery, Royal Prince Alfred Hospital (R.W.S., P.G.B., M.S.B.), Sydney South Western Area Health Service, University of Sydney, Sydney, Australia; The Baird Surgical Research Institute (P.G.B., M.S.B.), Newton, Australia; and the National Health and Medical Research Council Clinical Trials Centre (C.B.), University of Sydney, Sydney, Australia.