DOI:
10.1055/s-00000072
Seminars in Reproductive Medicine
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References
Oddsson K, Leifels-Fischer B, Wiel-Masson D. et al.
Superior cycle control with a contraceptive vaginal ring compared with an oral contraceptive containing 30 microg ethinylestradiol and 150 microg levonorgestrel: a randomized trial
Hum Reprod 2005; 20(2): 557-562
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