1 Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA.
2 Rutgers Robert Wood Johnson Medical School at New Brunswick.
3 Richard A. and Susan F. Smith Center for Outcomes Research in Cardiology, Beth Israel Deaconess Medical Center, Boston, MA.
4 Richard A. and Susan F. Smith Center for Outcomes Research in Cardiology, Beth Israel Deaconess Medical Center, Boston, MA; Harvard Medical School, Boston, MA. Electronic address: [email protected].