Van Vliet, H <br/><br/>
Biphasic versus triphasic oral contraceptives for contraception.  [electronic resource] 

 -  The Cochrane database of systematic reviews  2001 
 - CD003283 p.  digital 
<br/><br/> Publication Type: Journal Article; Review; Systematic Review 
<br/><br/><label>ISSN: </label>1469-493X 
<br/><br/><label>Standard No.: </label>10.1002/14651858.CD003283  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Contraception<br/>Contraceptives, Oral, Synthetic--adverse effects<br/>Ethinyl Estradiol<br/>Female<br/>Humans<br/>Levonorgestrel<br/>Menstruation--drug effects<br/>Norethindrone<br/>Pregnancy<br/>Randomized Controlled Trials as Topic