Open, multicenter comparison of efficacy, cycle control, and tolerability of a 23-day oral contraceptive regimen with 20 microg ethinyl estradiol and 75 microg gestodene and a 21-day regimen with 20 microg ethinyl estradiol and 150 microg desogestrel.
Source:http://linkedlifedata.com/resource/pubmed/id/11704101
