1. Inova Heart & Vascular Institute, Falls Church, VA (M.A.P., S.S.S., C.M.O.).
2. Department of Medicine, Duke University School of Medicine, Durham, NC (M.F.).
3. Cardiovascular Division, Brigham and Women’s Hospital, Boston, MA (S.D.S.).
4. Wichita, KA (C.C.).
5. Division of Cardiology, Duke University Medical Center, Durham, NC (G.M.F.).
6. Department of Medicine, University of Mississippi, Jackson (J.B.).
7. Section of Cardiology, San Francisco Veterans Affairs Medical Center and School of Medicine, University of California San Francisco (J.R.T.).
8. The CardioVascular Center of Tufts Medical Center, Boston, MA (M.A.K.).