1. From the Department of Health Policy and Management (K.E.J., A.K.J.) and Department of Biostatistics (E.J.O.), Harvard School of Public Health, Boston, MA; Cardiovascular Division (K.E.J.) and Division of General Internal Medicine (E.J.O., A.K.J.), Brigham and Women’s Hospital, Boston, MA; and VA Boston Healthcare System (K.E.J., A.K.J.), Boston, MA.