DOI: 10.1055/s-00000072

Seminars in Reproductive Medicine

References

Ahrendt HJ, Nisand I, Bastianelli C. et al.
Efficacy, acceptability and tolerability of the combined contraceptive ring, NuvaRing, compared with an oral contraceptive containing 30 microg of ethinyl estradiol and 3 mg of drospirenone 
Contraception 2006; 74(6): 451-457  

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