1. Division of Cardiology, Massachusetts General Hospital, Harvard Medical School, Boston (B.Q.Y.).
2. Division of Cardiology (A.C.P., A.J., D.L.M., J.D.S.)
3. Division of Cardiology, Texas Heart Institute, Houston (J.L.).
4. Department of Pathology and Immunology, Washington University School of Medicine in St. Louis, MO (K.B., J.D.S.).