Fehring, Richard J <br/><br/>
Cohort efficacy study of natural family planning among perimenopause age women.  [electronic resource] 

 -  Journal of obstetric, gynecologic, and neonatal nursing : JOGNN   
 - 351-8 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>1552-6909 
<br/><br/><label>Standard No.: </label>10.1111/1552-6909.12307  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adult<br/>Age Factors<br/>Cohort Studies<br/>Female<br/>Humans<br/>Middle Aged<br/>Natural Family Planning Methods--methods<br/>Perimenopause<br/>Pregnancy<br/>Pregnancy Rate<br/>Pregnancy, Unplanned<br/>Prospective Studies<br/>Sensitivity and Specificity