From Saint Louis (Mo) University School of Medicine (B.R.C., F.V.A., K.S.); University of Pittsburgh (Pa) (A.D.R., R.M.H., K.D.); Brown University (D.O.W., B.S.), Providence, RI; Montreal Heart Institute (M.G.B.); University of Michigan (B.P.), Ann Arbor; Bowman Gray School of Medicine (P.M.R.), Winston-Salem, NC; University of Alabama (W.J.R.), Birmingham; New York University (M.A.), New York; Mayo Clinic (S.S., R.F.), Rochester, Minn; Washington University (N.T.K.), St. Louis, Mo; and National... (At 1997-10-07)