title: Instrumental variables in epidemiological research: an assessment of the adoption rate and future trends.
authors.forename: Jarle
authors.initials: J
authors.lastname: Aarstad
mesh_terms: D004467:Economics / Q000639:trends*; D004812:Epidemiologic Methods; D004813:Epidemiology / Q000639:trends*; D006801:Humans; D012107:Research Design