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Efficacy, cycle control, and side effects of low- and lower-dose oral contraceptives: a randomized trial of 20 μg and 35 μg estrogen preparations

Contraceptive UseContraceptionContraceptive ImplantsHormonal ContraceptiveSexual And Reproductive HealthOral ContraceptiveContraceptive DiscontinuationReproductive HealthGynecologyContraceptive MethodsSide EffectsContraceptive UptakeRandomized TrialCycle ControlPublic HealthMedicineWomen's Health