1. Columbia University Medical Center, New York, NY (P.C.C.).
2. Brigham and Women’s Hospital, Boston, MA (M.R.M., M.M.G.).
3. Montefiore Einstein Center for Heart and Vascular Care, Bronx, NY (D.J.G., U.P.J.).
4. The Cleveland Clinic, OH (J.D.E.).
5. St. Vincent Heart Center, Indianapolis, IN (C.S.).
6. Henry Ford Health System, Detroit, MI (J.A.C.).
7. University of Colorado School of Medicine, Denver (J.C.C.).
8. University of Chicago School of Medicine and Medical Center, IL (N.U., G.S.).
9. Carolinas Medical Center, Charlotte, NC (E.R.S.).
10. St. Luke’s Medical Center, Milwaukee, WI (F.X.D.).
11. Methodist Hospital, San Antonio, TX (M.O.).
12. Tampa General Hospital, FL (R.H.).
13. Mount Sinai Hospital, New York, NY (A.C.A.).
14. University of Washington Medical Center, Seattle (C.M.).
15. Abbott, Chicago, IL (I.T., S.I.S., D.L.C.).
16. Integris Baptist Medical Center, Oklahoma City, OK (D.A.H.).