1. Division of Cardiovascular Disease, University of Alabama at Birmingham Birmingham, AL (N.P., N.S.B., G.A., P.A.).
2. Cardiovascular Division, Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (A.G., N.S.B.).
3. Department of Internal Medicine, Reno School of Medicine, University of Nevada, Reno, NV (R.D.).
4. Cardiovascular Division, University of Minnesota, Minneapolis, MN (R.K.).
5. Section of Cardiology, Birmingham Veterans Affairs Medical Center, AL (P.A.).