1. From the Department of Cardiology, Christchurch Hospital, Christchurch, New Zealand (J.R., I.C.M., A.M.R., I.G.C., C.F., R.W.T.); Auckland City Hospital, Auckland, New Zealand (R.N.D.); Cedars-Sinai Medical Center, Los Angeles, Calif (J.W., S.K., N.E.); The Alfred Hospital, Melbourne, Australia (H.K.); and Ohio State University, Columbus (W.T.A.).