1 Cardiovascular Division, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts; Richard A. and Susan F. Smith Center for Outcomes Research, Beth Israel Deaconess Medical Center, Boston, Massachusetts; Harvard Medical School, Boston, Massachusetts. Electronic address: jstrom@bidmc.harvard.edu.
2 Division of Cardiology, Department of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada.
3 University of Nebraska, Omaha, Nebraska.
4 Saint Luke's Mid-America Heart Institute, Kansas City, Missouri.
5 Baylor Scott and White The Heart Hospital at Plano, Plano, Texas.