Oral contraceptives and rheumatoid arthritis. Bias in observational studies of cause-effect relationships

J Chronic Dis. 1987;40(11):1063-7. doi: 10.1016/0021-9681(87)90121-4.
No abstract available

Publication types

  • Letter

MeSH terms

  • Arthritis, Rheumatoid / chemically induced*
  • Contraceptives, Oral / adverse effects*
  • Epidemiologic Methods
  • Female
  • Humans

Substances

  • Contraceptives, Oral