1. Division of Cardiology, Department of Medicine, Heart and Vascular Institute, University of Pittsburgh School of Medicine (R.C., F.E.Y.A., S.E.R.).
2. Department of Pharmacology and Chemical Biology (A.C.S.).
3. Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, PA (A.C.S., P.J.S.).
4. College of Arts and Sciences, Howard University, Washington, DC (I.O., J.R.).
5. Department of Medicine, VA Pittsburgh Healthcare System, PA (P.J.S.).
6. Division of Cardiology, Department of Medicine, University of Texas Southwestern Medical Center and VA North Texas Healthcare System, Dallas (O.O.).