title: Association does not prove causality.
authors.forename: B C
authors.initials: BC
authors.lastname: Doyle
mesh_terms: D000328:Adult; D006259:Craniocerebral Trauma / Q000628:therapy*; D004632:Emergency Medical Services / Q000706:statistics & numerical data*; D006801:Humans; D007442:Intubation, Intratracheal / Q000706:statistics & numerical data*; D012189:Retrospective Studies