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Family PlanningContraceptive MethodsReproductive Tract InfectionsDeveloping CountriesEconomic FactorsPrevention and ControlAcquired Immunodeficiency SyndromeViral DiseasesContraceptive AgentsSexually Transmitted DiseasesDemographic FactorsHIV InfectionsResearch MethodologySex BehaviorPsychological FactorsReproductive HealthReproductive BehaviorDeveloped CountriesProgram EvaluationOral Contraceptives