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Contraceptives, OralContraceptives, Oral, CombinedContraceptive AgentsContraceptives, Oral, HormonalContraceptive Agents, FemaleContraceptives, Oral, SyntheticContraceptive DevicesContraceptionContraceptive Devices, FemaleContraception BehaviorContraceptive Agents, MaleFamily Planning ServicesIntrauterine DevicesEthinyl EstradiolDesogestrelProgram EvaluationNorgestrelLevonorgestrelContraceptives, PostcoitalMestranolNorethindroneVaccines, ContraceptivePregnancy, UnplannedSterilization, ReproductiveProgram DevelopmentPregnancy, UnwantedPregnancyMedroxyprogesterone AcetateContraception, PostcoitalSpermatocidal AgentsMenstruationIntrauterine Devices, CopperNorethynodrelAbortion, InducedEthynodiol DiacetateContraception, ImmunologicHealth Knowledge, Attitudes, PracticeNorpregnenesEthinyl Estradiol-Norgestrel CombinationProgestinsUnited StatesContraceptives, Oral, SequentialContraceptives, Postcoital, HormonalGovernment ProgramsSterilization, TubalQuestionnairesAndrostenesMenstrual CycleParityProgesterone CongenersSex EducationIntrauterine Devices, MedicatedPregnancy in AdolescenceRisk FactorsContraceptive Devices, MaleSexual BehaviorMenstruation DisturbancesCondomsMegestrolDrug ImplantsContraceptives, Postcoital, SyntheticHealth EducationTime FactorsNational Health ProgramsFertilitySpermatogenesis-Blocking AgentsOvulation InhibitionHealth PromotionMedroxyprogesteroneAge FactorsTransdermal PatchNorpregnadienesCounselingEthisteroneManaged Care ProgramsLogistic ModelsCross-Sectional StudiesUterine HemorrhageEstradiol CongenersSocioeconomic FactorsMetrorrhagiaData CollectionRural PopulationEstrogensSexually Transmitted DiseasesHealth Services AccessibilityWomen's HealthCommunity Health ServicesReproductive Health ServicesCoitusCase-Control StudiesPatient Education as TopicAbortion ApplicantsNonoxynolAbortion, LegalMarriageXanthurenatesImmunization ProgramsInterviews as TopicSoftware