title: Instrumental variable methods for causal inference: early work and recent developments.
authors.affiliation: Biometry Research Group, National Cancer Institute, Bethesda, MD 20892, U.S.A.
authors.forename: Stuart G
authors.initials: SG
authors.lastname: Baker
mesh_terms: D015984:Causality; D015986:Confounding Factors, Epidemiologic; D003627:Data Interpretation, Statistical; D006801:Humans; D017063:Outcome Assessment, Health Care / Q000706:statistics & numerical data*