1. Department of Medicine, Cardiovascular Division (C.W.T., J.B.S., J.D.C., W.J.M.), Beth Israel Deaconess Medical Center, Boston, MA.
2. Harvard Medical School, Boston, MA (C.W.T., J.B.S., J.D.C., W.J.M.).
3. Richard A. and Susan F. Smith Center for Outcomes Research in Cardiology (J.B.S.), Beth Israel Deaconess Medical Center, Boston, MA.
4. Department of Radiology (W.J.M.), Beth Israel Deaconess Medical Center, Boston, MA.