1. Section of Health Policy and Equity at the Richard A. and Susan F. Smith Center for Outcomes Research, Beth Israel Deaconess Medical Center, and Division of Cardiology, Massachusetts General Hospital, Boston, Massachusetts (A.S.O.)
2. Section of Health Policy and Equity at the Richard A. and Susan F. Smith Center for Outcomes Research, Beth Israel Deaconess Medical Center, Boston, Massachusetts (R.K.W.)
3. Harvard T.H. Chan School of Public Health and Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts (E.J.O., J.F.F.).