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Contraceptives, OralContraceptives, Oral, CombinedContraceptive AgentsContraceptives, Oral, HormonalContraceptive Agents, FemaleContraceptives, Oral, SyntheticContraceptive DevicesContraceptionContraceptive Devices, FemaleContraception BehaviorContraceptive Agents, MaleIntrauterine DevicesFamily Planning ServicesEthinyl EstradiolDesogestrelNorgestrelLevonorgestrelContraceptives, PostcoitalMestranolNorethindroneVaccines, ContraceptivePregnancy, UnplannedSterilization, ReproductivePregnancy, UnwantedMedroxyprogesterone AcetateSpermatocidal AgentsContraception, PostcoitalPregnancyIntrauterine Devices, CopperMenstruationNorethynodrelAbortion, InducedEthynodiol DiacetateContraception, ImmunologicNorpregnenesEthinyl Estradiol-Norgestrel CombinationProgestinsComparative Effectiveness ResearchContraceptives, Oral, SequentialContraceptives, Postcoital, HormonalHealth Knowledge, Attitudes, PracticeSterilization, TubalAndrostenesMenstrual CycleCost-Benefit AnalysisIntrauterine Devices, MedicatedProgesterone CongenersParityContraceptive Devices, MaleSex EducationPregnancy in AdolescenceDrug ImplantsMenstruation DisturbancesMegestrolTreatment OutcomeContraceptives, Postcoital, SyntheticCondomsSexual BehaviorTime FactorsRisk FactorsQuestionnairesSpermatogenesis-Blocking AgentsOvulation InhibitionFertilityMedroxyprogesteroneTransdermal PatchNorpregnadienesEthisteroneUnited StatesUterine HemorrhageEstradiol CongenersMetrorrhagiaAge FactorsEstrogensCounselingCase-Control StudiesLogistic ModelsNonoxynolCoitusProgram EvaluationReproductive Health ServicesAbortion ApplicantsSexually Transmitted DiseasesXanthurenatesWomen's HealthAbortion, LegalMarriageProspective StudiesReproductive HistoryAmenorrheaCoitus InterruptusGreat BritainSocioeconomic FactorsBirth RateCohort StudiesCross-Sectional StudiesRandomized Controlled Trials as TopicMenPostpartum PeriodDelayed-Action Preparations