title: Using observational data to estimate treatment effects.
authors.forename: Therese A
authors.initials: TA
authors.lastname: Stukel
authors.forename: Elliott S
authors.initials: ES
authors.lastname: Fisher
authors.forename: David E
authors.initials: DE
authors.lastname: Wennberg
mesh_terms: D015233:Models, Statistical; D019370:Observation; D036301:Qualitative Research; D016032:Randomized Controlled Trials as Topic; D012107:Research Design; D015983:Selection Bias; D016896:Treatment Outcome