1. Minneapolis Heart Institute, Abbott Northwestern Hospital, MN (M.M., J.J., M.N.B., E.S.B.).
2. Division of Cardiovascular Medicine, Hennepin Healthcare, Minneapolis, MN (M.M.).
3. Department of Internal Medicine, Rutgers New Jersey Medical School, Newark (A.K.).
4. Department of Internal Medicine, Ascension St John Hospital, Detroit, MI (B.A.).
5. Division of Cardiology, Department of Medicine, University of Arkansas, Little Rock, (M.S.).
6. Division of Cardiology, Ain Shams University, Cairo, Egypt (M.S.).
7. University of Missouri Kansas City and Mid America Heart Institute (M.O.).
8. Division of Cardiology, University of Texas Medical Branch, Galveston (A.E.).
9. Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN (Y.S.).
10. Division of Cardiology, Department of Medicine, Case Western Reserve University School of Medicine, Cleveland, OH (M.H.S.).
11. Veterans Affairs North Texas Health Care System and University of Texas Southwestern Medical Center, Dallas (S.B.).
12. Division of Cardiology, Henry Ford Health System, Detroit, MI (K.A.).
13. Division of Cardiology, McGill University Health Centre, Montreal, QC, Canada (S.R.).