1. Division of Cardiology, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia (S.S.).
2. Division of Cardiology, Department of Medicine, Brigham and Women’s Hospital, Boston, MA (B.C., A.S.D., E.F.L., M.A.P., S.D.S.).
3. Division of Cardiology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL (S.J.S.).
4. Cardiovascular Division, VA Medical Center and University of Minnesota, Minneapolis (I.A).
5. Department of Medicine, Montreal Heart Institute, University of Montreal, Quebec, Canada (J.L.R., E.O.).
6. Department of Internal Medicine, University of Michigan, Ann Arbor (B.P.).
7. Sarver Heart Center, Division of Cardiology, University of Arizona College of Medicine, Tucson (N.K.S.).
8. Cardiology Division, University of Utah, Salt Lake City (J.C.F.).