title: Beyond exchangeability: the other conditions for causal inference in medical research.
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Hernán
mesh_terms: D035843:Biomedical Research; D015986:Confounding Factors, Epidemiologic; D003627:Data Interpretation, Statistical; D006801:Humans; D059012:Lost to Follow-Up; D012107:Research Design; D016896:Treatment Outcome