DOI: 10.1055/s-00000072

Seminars in Reproductive Medicine

References

Sulak PJ, Smith V, Coffee A, Witt I, Kuehl AL, Kuehl TJ.
Frequency and management of breakthrough bleeding with continuous use of the transvaginal contraceptive ring: a randomized controlled trial 
Obstet Gynecol 2008; 112(3): 563-571  

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