Division of Epidemiology, Dalla Lana School of Public Health, University of Toronto (J.A.J., A.S., P.O.); MAP Centre for Urban Health Solutions, St Michael's Hospital (J.A.J., P.O.); Department of Psychiatry (S.N.V.) and Institute of Health Policy, Management and Evaluation (S.N.V., J.G.R.), University of Toronto; ICES (S.N.V., J.G., A.B., X.W., J.G.R.); and Women's College Hospital (S.N.V.), Toronto, Ontario, Canada; Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC (Siddiqi); Department of Social and Behavioral Sciences, Harvard T. H. Chan School of Public Health, Boston, MA (A.S.); and Keenan Research Centre (J.G.R.) and Department of Obstetrics and Gynecology (J.G.R.), St Michael's Hospital, Toronto, Ontario, Canada