(Q36479349)
Statements
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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 (English)
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Esdaile JM
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Horwitz RI
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1 January 1986
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39
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10
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841-852
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Identifiers
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