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==References==   
 
==References==   
 
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<references/>
 
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Trussell J. Hatcher RA, Cates W Jr, Stewart FH, Kost K. A guide to interpreting contraceptive efficacy studies. Obstet Gynecol. 1990; 76 :558-567.
    
[[Category:Medicine]]
 
[[Category:Medicine]]
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