Efficacy, acceptability and tolerability of the combined contraceptive ring, NuvaRing, compared with an oral contraceptive containing 30 μg of ethinyl estradiol and 3 mg of drospirenone
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PII: S0010-7824(06)00308-8
doi:10.1016/j.contraception.2006.07.004
© 2006 Elsevier Inc. All rights reserved.
