Esdaile, J M <br/><br/>
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] 

 -  Journal of chronic diseases  1986 
 - 841-52 p.  digital 
<br/><br/> Publication Type: Journal Article; Research Support, Non-U.S. Gov't 
<br/><br/><label>ISSN: </label>0021-9681 
<br/><br/><label>Standard No.: </label>10.1016/0021-9681(86)90086-x  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arthritis, Rheumatoid--diagnosis<br/>Contraceptives, Oral--administration & dosage<br/>Diagnostic Errors<br/>Female<br/>Humans<br/>Research Design