DOI:
10.1055/s-00000072
Seminars in Reproductive Medicine
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References
Bjarnadóttir RI, Tuppurainen M, Killick SR.
Comparison of cycle control with a combined contraceptive vaginal ring and oral levonorgestrel/ethinyl estradiol
Am J Obstet Gynecol 2002; 186(3): 389-395
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