1. San Jose Medical Center, Kaiser Permanente, CA (J.J.J.).
2. Duke Clinical Research Institute, Duke University School of Medicine, Durham, NC (M.B., A.C., S.V., C.B.F., K.L.L., W.S.J., D.B.M., P.S.D., M.R.P.).
3. Division of Cardiology, University of British Columbia, Vancouver, Canada (C.B.F.).
4. Department of Medicine, Tufts Medical Center, Boston, MA (J.E.U.).
5. Massachusetts General Hospital, Harvard Medical School, Boston (U.H.).
6. Research Centre, Montreal Heart Institute, Montreal, Quebec, Canada (J.-C.T.).
7. University of Kentucky Hospital, Lexington, KY (V.L.S.).
8. Hunterdon Medical Center, Flemington, NJ (A.E.).