title: Software for optimal matching in observational studies.
authors.forename: E J
authors.initials: EJ
authors.lastname: Bergstralh
authors.forename: J L
authors.initials: JL
authors.lastname: Kosanke
authors.forename: S J
authors.initials: SJ
authors.lastname: Jacobsen
mesh_terms: D000465:Algorithms; D016022:Case-Control Studies; D004812:Epidemiologic Methods; D006801:Humans; D008432:Mathematical Computing; D012984:Software