1. From the Duke Clinical Research Institute, Duke University School of Medicine (A.K., Z.L., J.K.H., G.C.H., R.A.M., E.D.P., W.S.J., S.V.)
2. Duke University, Durham, NC; MedStar Washington Hospital Center/Georgetown University, DC (V.H.T.)
3. The Heart Hospital Baylor Plano Research Center, TX (M.J.M.)
4. Department of Biostatistics and Bioinformatics (R.A.M.)
5. Mid America Heart Institute, Kansas City, MO (D.J.C.).