title: The protective effect of the oral contraceptive pill on rheumatoid arthritis: an overview of the analytical epidemiological studies using meta-analysis.
authors.affiliation: Department of Epidemiology and Rheumatology, St. Bartholomew's Hospital, London.
authors.forename: T D
authors.initials: TD
authors.lastname: Spector
authors.forename: M C
authors.initials: MC
authors.lastname: Hochberg
mesh_terms: D001172:Arthritis, Rheumatoid / Q000453:epidemiology* / Q000517:prevention & control; D016022:Case-Control Studies; D016001:Confidence Intervals; D003278:Contraceptives, Oral, Hormonal / Q000627:therapeutic use*; D005060:Europe / Q000453:epidemiology; D005260:Female; D006801:Humans; D015201:Meta-Analysis as Topic; D016017:Odds Ratio; D011446:Prospective Studies; D012306:Risk; D014481:United States / Q000453:epidemiology
chemical_list: D003278:Contraceptives, Oral, Hormonal