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. [electronic resource]

By: Contributor(s): Producer: 19861121Description: 841-52 p. digitalISSN:
  • 0021-9681
Subject(s): Online resources: In: Journal of chronic diseases vol. 39
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Publication Type: Journal Article; Research Support, Non-U.S. Gov't

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