bibliographicCitation |
Winkler UH, Ferguson H, Mulders JA. Cycle control, quality of life and acne with two low-dose oral contraceptives containing 20 microg ethinylestradiol. Contraception. 2004 Jun;69(6):469–76. doi: 10.1016/j.contraception.2003.12.017. PMID: 15157791. |