1. From the Departments of Internal Medicine (Z.G., M.V.S., D.D.H., O.M.K., E.D.L., M.A.J., B.C., Y.W., A.K.C., J.B.M., T.J.H., P.J.M., L.-S.S., M.E.A.) and Molecular Physiology and Biophysics (P.J.M., M.E.A.), Carver College of Medicine, University of Iowa, Iowa City, IA.