1. The CardioVascular Center, Tufts Medical Center, Boston, MA (N.K.K., R.H.K., C.D.K., J.E.U.).
2. West Virginia University Heart and Vascular Institute, Morgantown (M.A.A., J.A.M.).
3. Hackensack University Medical Center, NJ (H.F.).
4. Greenville Memorial Hospital, SC (Z.H.G.).
5. University of Buffalo, NY (V.S.I.).
6. Massachusetts Institute of Technology, Cambridge (N.J.).
7. Detroit Medical Center, MI (A.K., T.L.S.).
8. University of Arizona, Phoenix (K.L.).
9. Spectrum Health, Grand Rapids, MI (R.D.M., D.H.W.W.).
10. Columbia University, New York, NY (J.W.M).