1. From University Hospital Rotterdam (J.P.O., E.B., M.L.S.), Erasmus Medical Center, Rotterdam, the Netherlands; Division of Cardiology (P.A.), University of Alberta, Edmonton, Alberta, Canada; Centocor, Inc (E.S.B., J.S.C.), Malvern, Pa; Duke University Medical Center (E.M.O.), Durham, NC; Department of Cardiology (S.J., L.W.), Uppsala, Sweden; and The Cleveland Clinic Foundation (E.T.), Cleveland, Ohio.