1. Duke Clinical Research Institute, Durham, NC (S.J.G., A.F.H., J.-L.S., A.C., R.M.C., C.M.O., R.J.M.).
2. Division of Cardiology, Duke University School of Medicine, Durham, NC (S.J.G., A.F.H., R.M.C., R.J.M.).
3. Department of Medicine, University of Mississippi Medical Center, Jackson (J.B.).
4. Canadian VIGOUR Centre, University of Alberta, Edmonton, Canada (P.W.A., J.A.E.).
5. Centre d’Investigation Clinique Plurithématique 1433, INSERM U1116, Université de Lorraine, CHRU de Nancy, France (F.Z., J.P.F.).
6. Cardiology, University of Brescia, Italy (M.M.).
7. University of Groningen, the Netherlands (A.A.V.).
8. Inova Heart and Vascular Institute, Falls Church, VA (C.M.O.).