1. Division of Cardiovascular Medicine, University of Southern California, Los Angeles (D.M.S.).
2. Cardiovascular Division, Brigham and Women’s Hospital, Boston, MA (A.S.D.).
3. Division of Cardiovascular Medicine, The Ohio State University Medical Center, Columbus (W.T.A.).
4. University of Alabama at Birmingham (R.C.B.).
5. Florida Hospital Transplant Institute, Orlando (N.R.).
6. Cardiovascular Medicine Division, Lancaster General Hospital, PA (L.D.R.).
7. Division of Cardiovascular Medicine, Scripps Green Hospital, La Jolla, CA (J.T.H.).
8. Division of Cardiology, St Francis Hospital, Roslyn, NY (R.A.J.).
9. Centracare Heart and Vascular Center, St Cloud, MN (J.P.).
10. Sanford Cardiovascular Institute, Sanford University of South Dakota Medical Center, Sioux Falls (O.T.J.).
11. Advocate Heart Institute, Naperville, IL (M.R.C.).
12. Abbott, Sylmar, CA (J.D.H., M.-E.B., P.B.A.).
13. Division of Advanced Heart Failure and Transplant Cardiology, Vanderbilt University Medical Center, Nashville, TN (L.W.S.).