1. From the Division of Endocrinology (A.O.D.), Department of Molecular Genetics and Microbiology (S.K., G.M.L., F.W., D.A.M.), and Division of Cardiovascular Medicine and Department of Medicine (S.H., Y.L., B.H.A.), Duke University Medical Center, Durham, NC; and Division of Cardiology and Department of Medicine, Durham Veterans Affairs Medical Center, Durham, NC (B.H.A.).