title: Oral contraceptives and rheumatoid arthritis; further evidence for a protective effect independent of duration of pill use.
authors.affiliation: Department of Rheumatology, University Hospital, Leiden, The Netherlands.
authors.forename: J M
authors.initials: JM
authors.lastname: Hazes
authors.forename: B A
authors.initials: BA
authors.lastname: Dijkmans
authors.forename: J P
authors.initials: JP
authors.lastname: Vandenbroucke
authors.forename: R R
authors.initials: RR
authors.lastname: De Vries
authors.forename: A
authors.initials: A
authors.lastname: Cats
mesh_terms: D000328:Adult; D001172:Arthritis, Rheumatoid / Q000097:blood / Q000453:epidemiology* / Q000517:prevention & control; D016022:Case-Control Studies; D003278:Contraceptives, Oral, Hormonal / Q000008:administration & dosage* / Q000009:adverse effects; D004334:Drug Administration Schedule; D005260:Female; D015804:HLA-DR4 Antigen / Q000032:analysis; D006801:Humans; D015994:Incidence; D008875:Middle Aged; D009426:Netherlands / Q000453:epidemiology; D010045:Outpatients; D012307:Risk Factors
chemical_list: D003278:Contraceptives, Oral, Hormonal; D015804:HLA-DR4 Antigen