1. From the Heart and Vascular Institute, Henry Ford Hospital, Detroit, MI (D.E.L., T.H., T.S.); the Department of Public Health Sciences, Henry Ford Hospital, Detroit, MI (E.L.P., K.W.); Mid America Heart Institute, Kansas City, MO (J.A.S.); and the Center for Health Services Research, Henry Ford Hospital, Detroit, MI (D.E.L., L.K.W.).