TY  - GEN
AU  - Esdaile,J M
AU  - Horwitz,R I
TI  - Observational studies of cause-effect relationships: an analysis of methodologic problems as illustrated by the conflicting data for the role of oral contraceptives in the etiology of rheumatoid arthritis
SN  - 0021-9681
PY  - 1986///1121
KW  - Arthritis, Rheumatoid
KW  - diagnosis
KW  - Contraceptives, Oral
KW  - administration & dosage
KW  - Diagnostic Errors
KW  - Female
KW  - Humans
KW  - Research Design
N1  - Publication Type: Journal Article; Research Support, Non-U.S. Gov't
UR  - https://doi.org/10.1016/0021-9681(86)90086-x
ER  -