Periodic abstinence: how well do new approaches work?  [electronic resource] 

 -  Population reports. Series I, Periodic abstinence  Sep 1981 
 - I33-71 p.  digital 
<br/><br/> Publication Type: Comparative Study; Journal Article 
<br/><br/><label>ISSN: </label>0097-9090 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Attitude<br/>Body Temperature<br/>Catholicism<br/>Cervix Mucus--metabolism<br/>Evaluation Studies as Topic<br/>Family Planning Services--trends<br/>Female<br/>Humans<br/>Menstruation<br/>Natural Family Planning Methods<br/>Pregnancy<br/>Sexual Abstinence