title: The authors respond.
authors.affiliation: Departments of Epidemiology and Biostatistics, Harvard School of Public Health, Boston, MA Department of Epidemiology, University of North Carolina, Chapel Hill, NC, tvanderw@hsph.harvard.edu.
authors.forename: Tyler J
authors.initials: TJ
authors.lastname: VanderWeele
authors.forename: Whitney R
authors.initials: WR
authors.lastname: Robinson
mesh_terms: D015984:Causality; D006801:Humans; D044469:Racial Groups / Q000706:statistics & numerical data*