title: Cohort studies: history of the method. II. Retrospective cohort studies.
authors.affiliation: University of Oxford, Oxford.
authors.forename: R
authors.initials: R
authors.lastname: Doll
mesh_terms: D016022:Case-Control Studies; D015331:Cohort Studies; D049673:History, 20th Century; D006801:Humans; D012189:Retrospective Studies; D014481:United States