1. Department of Cardiac Surgery, University of Michigan Medical School, Ann Arbor, MI (M.P.T.).
2. Division of Cardiology and Duke Clinical Research Institute, Duke University, Durham, North Carolina (A.C.F.).
3. Department of Internal Medicine, University of Texas Southwestern, Dallas, TX (J.D.P.).
4. Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN (S.V.).
5. Division of General Internal Medicine, Weill Cornell Medical College, New York, NY (M.R.S.).