1. From the University of Arizona (F.I.M., D.S., K.G.), Tucson, Ariz; The Heart Hospital, London, United Kingdom (W.J.M.); University of Padua Medical School, Padua, Italy (C.B., B.B., D.C., A.N., G.T.); National Institutes of Health, Clinical Center (D.A.B.), Bethesda, and Johns Hopkins Hospital (H.C., H.T.), Baltimore, Md; University Medical Center Utrecht, Utrecht, the Netherlands (M.G.P.J.C., R.H.); Strong Memorial Hospital (J.P.D.) and University of Rochester Medical Center (W.Z.), Rochester, NY;...