From the Division of Cardiology (K.K., W.A.M., M.F.T., B.A.L., M.R.B.) and Division of Endocrinology, Metabolism, and Diabetes (W.M.W., E.C.R.), University of Colorado Health Sciences Center, and the Cardiology Section, Denver Health Medical Center (C.S.L.), Denver, Colo; and the Metabolic Research Unit, University of California, San Francisco (J.D.B., R.C.J.R.). (At 2001-02-27)