1. From the Endocrinology, Diabetes, and Hypertension Division (O.G., J.S.W., G.H.W.), Division of Cardiology (T.S.P.), and the Channing Laboratory (B.A.R.), Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Mass; Cardiovascular Genetics (P.N.H.), Cardiology Division, University of Utah, Salt Lake City; and the Department of Medicine (N.J.B.), Vanderbilt University, Nashville, Tenn.