1 From the Harvard T.H. Chan School of Public Health and Brigham and Women's Hospital, Boston (K.E.J., A.M.E.); the Office of the Assistant Secretary for Planning and Evaluation, Department of Health and Human Services, Washington, DC (K.E.J., N.D.L., S.H.S.); and the Centers for Medicare and Medicaid Services, Baltimore (P.H.C., K.G.).