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.
Authors
T D Spector
,
A J Silman
PMID:
3654906
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