title: Casual inference.
authors.forename: K J
authors.initials: KJ
authors.lastname: Rothman
authors.forename: S
authors.initials: S
authors.lastname: Lanes
authors.forename: J
authors.initials: J
authors.lastname: Robins
mesh_terms: D004812:Epidemiologic Methods; D006493:Heparin / Q000008:administration & dosage* / Q000627:therapeutic use; D006801:Humans; D007262:Infusions, Intravenous; D007279:Injections, Subcutaneous; D015201:Meta-Analysis as Topic; D013924:Thrombophlebitis / Q000188:drug therapy*
chemical_list: D006493:Heparin