1 From the Department of Data Sciences, Dana-Farber Cancer Institute (D.H.), Boston University (R.B.D.), Harvard T.H. Chan School of Public Health (D.H., D.J.H.), and the Department of Health Care Policy, Harvard Medical School, and the Department of Biostatistics, Harvard T.H. Chan School of Public Health (S.-L.T.N.) - all in Boston; the Department of Biostatistics and Center for Statistical Sciences, Brown University School of Public Health, Providence, RI (C.G., J.W.H.); and Nuffield Department of Population Health, University of Oxford, Oxford, United Kingdom (D.J.H.).